Jack and Kate, who have been together since college, are at JFK Airport, where he is about to leave to take up a twelve-month internship with Barclays in London. She fears the separation will be detrimental to their relationship and asks him not to go, but he reassures her that their love is strong enough to last and that the internship will be beneficial to their future together. Thirteen years later, Jack is a wealthy bachelor and Wall Street executive in New York City, with millions at his disposal. At work, he is putting together a multi-billion dollar merger and has ordered an emergency meeting on Christmas Day, disregarding his employees' desires to spend time with their families. In his office, on Christmas Eve, he gets a message to contact Kate. Jack ponders whether Kate is attempting to reconnect, but chooses not to return her call. On his way home, Jack is in a convenience store when a young man, Cash, enters claiming to have a winning lottery ticket worth $238, but the store clerk refuses him, saying the ticket is a forgery. Cash pulls out a gun, and Jack, trying to defuse the situation, offers to buy the ticket, calling it a “business deal." Cash eventually agrees. Outside, Jack patronizingly tries to help Cash, who, feeling like he is being preached to, asks Jack if anything is missing from his own life. When Jack haplessly says he has everything he needs, Cash enigmatically remarks that Jack has "brought this upon himself" and walks away. A puzzled Jack returns to his penthouse to sleep. Jack wakes up the next morning on Christmas Day in a suburban New Jersey bedroom with Kate and two children. Confused, he rushes out to his home in New York, but the doorman and his neighbor claim not to recognize him. He goes to his office, which is closed for the holiday, and is turned away by security. Outside, he encounters Cash, now smartly dressed and driving Jack's Ferrari. Although Cash offers to explain what is happening, all he does is make a vague reference to "the organization" and tell Jack that he is getting "a glimpse" of something that will help him to figure out for himself what is important in life. Jack returns to the house and tries to tell Kate the truth, but she reacts angrily. He receives some help from his young daughter, Annie, who believes Jack is an alien and her real father will soon return. He struggles to adjust to fatherhood and his modest family life, finding that he is a tire salesman working for Kate's father and Kate is a non-profit lawyer. When he discovers this is the life he would have had if he had stayed in the U.S. as Kate had asked, he lashes out at Kate and expresses resentment for her holding him back. Jack later apologizes and grows closer to Annie and her baby brother, Josh, and realizes he never fell out of love with Kate. He comes to enjoy his family life and begins succeeding at his sales job. One day his former boss, Peter Lassiter, comes in to have a tire blowout fixed. Taking advantage of the chance meeting, Jack uses his business savvy to impress Lassiter, who invites Jack to his office, where Jack worked in his 'other' life. There, after a short interview, Lassiter offers him a position. While he is excited by the potential salary and other perks, including a lavish apartment in Manhattan, Kate is less certain. She expresses deep misgivings about raising their children in the city and leaving their old life behind, telling Jack that they should be thankful for the life they have. Jack returns home only to discover his plane ticket to London. Upon closer examination, he realizes that he did in fact take the flight, but then came back the next day to be with Kate. Reminded of Jack's choice, she reciprocates his feelings by telling Jack that she is prepared to follow him and move the family to the city in order to do just as Jack did for her. Jack encounters Cash at a grocery store and is frightened by the idea of leaving this life, which he now loves, behind. Cash reminds him that a glimpse, by definition, is an impermanent thing. Jack returns home again and watches over his children and then tries to stay awake while watching Kate sleep but eventually does fall asleep and wakes to find he has returned to his old life, on Christmas Day. Jack returns to the office to close the big acquisition deal, making plans to fly to Aspen to prevent it from failing, but first visits Kate, now an unmarried corporate lawyer, preparing to move to Paris. She only called him to return a box of his old possessions, and when Jack asks her to meet for coffee, she suggests that he look her up if he's ever in Paris. Jack chooses not to go to Aspen and instead chases after Kate to the airport and begs her to stay. She reacts with confusion, as their relationship has been over for more than a decade, and refuses. Jack then describes in detail their life together and their children, saying it was a dream that seemed real and admitting that he can no longer conceive of a life without her. Intrigued, she eventually agrees to go with him for a coffee. From a distance, they are seen talking inaudibly and laughing over their coffees and their possible future.

At the Los Angeles port, a heist crew driving three heavily modified Honda Civics hijack a semi-truck trailer carrying electronic goods and escape into the night along the Terminal Island Freeway. Meanwhile, LAPD officer Brian O'Conner is sent undercover as part of a joint LAPD- FBI task force to locate the crew responsible.Brian investigates Toretto's Market & Cafe managed by Mia, sister of notorious street racer Dominic “Dom” Toretto. When Dom's crew arrives — Vince, Leon, Jesse, and Dom's girlfriend Letty — Vince becomes suspicious of Brian and picks a fight with him. As a result of the fight, Dom threatens to fire Brian from his undercover job at Harry's garage and ban him from the market, but Harry manages to reason with him and keep Brian employed. Brian brings a modified 1995 Mitsubishi Eclipse RS to a car meet, hoping to find a lead on the heist crew. Dom arrives in his Mazda RX-7 and initiates a race. Without credibility, Brian wagers his car; he, Dom, and two other drivers race. Brian's car malfunctions and Dom wins the race, but LAPD officers arrive, forcing Dom to flee. Brian rescues him, helping him escape, inadvertently venturing into territory held by a rival racing gang led by Johnny Tran and his cousin Lance. Tran and Lance destroy the Eclipse, and the two are forced to return to Dom's home on foot. Dom reiterates that Brian still owes him a ten-second car. Brian delivers a decrepit MK4 Toyota Supra to Dom's garage, and the crew begins the process of restoring it. At the same time, he begins dating Mia and looks into Tran's finances. Hector comes to Harry’s garage and speaks to Brian with the intent to buy performance parts for Honda Civics. While Brian is investigating one of Hector's garages, looking for the Civics that have been involved in the heists, Brian is discovered by Dom and Vince; he convinces the latter he is researching Tran's gang's vehicles in preparation for Race Wars. In the process, the three discover a large number of electronic goods, which Brian reports to his superiors, LAPD Sergeant Tanner and FBI Special Agent Bilkins. Tran is arrested, but is found to have acquired the goods legally. An enraged Bilkins berates Tanner and Brian. Bilkins then informs Brian that the truck drivers have begun arming themselves to kill the hijackers and notifies him that he has 36 hours to find them, whom the former believes was Dom all along. Brian and Dom attend Race Wars, where Jesse wagers and loses his father's MK3 Volkswagen Jetta in a drag race against Tran driving his Honda S2000. Jesse flees upon losing, resulting in a confrontation between Dom and Tran. Tran accuses Dom of being a narc, and the two fight before being broken up. That evening, Brian witnesses Dom leaving with his crew to carry out the heist. Brian reveals his identity to a distraught Mia, convincing her to help him knowing their danger. Dom, Letty, Vince, and Leon attempt to hijack the truck; the driver fires on Vince, critically injuring him and running Letty off the road in the process. Brian and Mia catch up to help, but Brian is forced to reveal his identity when he calls for MEDEVAC to save Vince. Dom, Mia, Letty, and Leon flee the scene before the police arrive. Later, Brian arrives to arrest Dom, but the latter demands he leave in order to save Jesse from the danger he's in from Tran's gang. Jesse arrives, pleading for help, but he is gunned down by Tran and Lance on motorcycles. Brian foregoes his arrest of Dom and gives chase to Tran and Lance, with Dom getting into his father's 1970 Dodge Charger R/T to pursue Tran and avenge Jesse. During the chase, Dom runs Lance off the road before Brian accidentally kills Tran. Brian then pursues Dom, and the two agree to a quarter-mile race over a railroad crossing. The race narrowly ends in a draw, but Dom is t-boned by a passing truck. Instead of arresting him, Brian hands over the keys to his Supra, reminding Dom he was owed a ten-second car. He walks away as Dom drives off. In the post-credits scene, Dom is seen driving through Baja California, Mexico, in a 1970 Chevrolet Chevelle SS.

Andy Kasper is a marketer who quits his job for something more fulfilling. He gets hired at LaHonda Research Institute, where Francis Benoit assigns him to design the PC99, a $99 PC. He moves into a run-down boarding house where he meets his neighbor Alisa, an artist. He puts together a team of unassigned LaHonda employees. The team includes: Salman Fard, a short, foreign man with an accent who is hacking into CIA files when Andy meets him; Curtis "Tiny" Russell, a massively obese, anthropophobic man; and Darrell, a tall, blond, pierced, scary, germaphobic, deep-voiced man with personal space issues who regularly refers to himself in the third person. The team finds many non-essential parts, but cannot reach the $99 mark. It is Salman's idea to put all the software on the internet, eliminating the need for a hard drive, RAM, a CD-ROM drive, a floppy drive, and anything that holds information. The computer has been reduced to a microprocessor, a monitor, a mouse, a keyboard, and the internet, but it is still too expensive. Having seen the rest of his team watching a hologram of an attractive lady the day before, in a dream Andy is inspired to eliminate the monitor in favor of the cheaper holographic projector. The last few hundred dollars come off when Darrell suggests using virtual reality gloves instead of a mouse and keyboard. Tiny then writes a "hypnotizer" code to link the gloves, the projector, and the internet, and they're done. But immediately before he finishes, the whole team (except for Tiny, who is still writing the code) quits LaHonda after being told that there are no more funds for their project, but sign a non-exclusive patent waiver, meaning that LaHonda will share the patent rights to any technology they had developed up to that point. After leaving LaHonda, they pitch their product to numerous companies, but do not get accepted, mainly because the prototype emagi (e lectronic magi c) was ugly, and something always seemed to go wrong during the demonstration of their product. Alisa, whose relationship with Andy has been growing steadily, helps improve the emagi's looks, which allows the team to have their callback with an executive. They agreed to give her 51% of their company in exchange for getting their product manufactured and for getting Andy's Porsche bought back, which he had to sell to raise money to build a new emagi after leaving LaHonda. Unfortunately, she then sells the patent rights to the emagi to Francis Benoit, who plans to sell the emagi at $999 a piece and reap a huge profit. The team interrupts the meeting in which Benoit will introduce the emagi to the world. It introduces an even newer computer that he and his team developed and manufactured at LaHonda, which was in a state of disaster when they arrived. It was a small silver tube that projected a hologram and lasers which would detect where the hands were, eliminating the need even for virtual reality gloves. Andy then reminds Benoit of the non-exclusive patent waiver, which had been Benoit's idea in the first place.

In 50 BC, in an Abyssinian castle, Princess Nawa uses a pair of enchanted earrings to escape an arranged marriage by swapping bodies with a slave girl. When each woman wears one of the earrings, their bodies are magically swapped while their minds remain in place. In a modern-day suburban town in California, Jessica Spencer is the beautiful but mean-spirited "hot chick". Her closest friends are April, Keecia and Lulu. April is Jessica's best friend, and all four girls are cheerleaders. At school one day, Jessica makes fun of an overweight girl named Hildenburg and a Wiccan girl named Eden. After that, she and her friends visit the local mall, where Jessica gets her rival Bianca into trouble and finds the earrings in an African -themed store owned by Madame Mambuza. The earrings are not for sale, but Jessica steals them anyway. Shortly afterward, small-time, 30-year-old criminal Clive Maxtone robs a nearby gas station. When Jessica and her friends stop and mistake him for an employee, he services their car to avoid raising suspicion. She accidentally drops one of the earrings on the ground, the girls drive away, and Clive picks up the earring. In their respective homes that evening, Jessica and Clive put on their earrings. When they wake up the next morning, each of them is trapped in the other's body. This is especially difficult for Jessica, who has a cheering competition and the senior prom coming up soon. After Jessica convinces her friends of who she is, they help her investigate the body swap. Hildenburg, Eden and Bianca are all innocent, Hildenburg and Eden join Jessica after she apologizes to them, and Eden finds a picture of the earrings on the internet. When the girls return to the African store, Madame Mambuza explains how the earrings work and tells the girls they must find the other earring soon or the change will become permanent at the next full moon. Meanwhile, Jessica is hired for two jobs while secretly living with April. At her own home, where she works as a gardener, her parents tell her about their marital problems and she helps them rekindle their sex life. At school, while cleaning the boys' locker room as a custodian, she eavesdrops on her boyfriend Billy, who truly loves her unconditionally, and April's boyfriend Jake, who has been cheating on her. Faced with Jake's infidelity, April begins to fall in love with Jessica (although she's still stuck in Clive's body), who agrees to take her to the prom. At the cheering competition, Jessica signals romantically to Billy while disguised as the school mascot, but when the head of her costume falls off, he becomes confused and leaves with Bianca. Jessica goes to the prom with April and they kiss. Jake sees this and is so upset, he spills his drink on his date. April confesses to being in love with Jessica, who tells April she is perfect and doesn't need anybody. Jessica tries to win Billy back, telling Billy it's her in Clive's body, but he is so shocked and confused that he runs off. During this time, Clive has been using Jessica's body to make money from men, including Billy, who gives him his money and car, believing he is Jessica. Clive then tries to run him over. On the evening of the prom, Hildenburg sees a video of Clive in Jessica's body robbing a man on the TV news, goes to the scene of the crime, and finds a business card for the strip club where Clive works as a pole dancer. She informs Jessica at the prom, and the girls go to the club. When they find Clive, Jessica steals his earring and puts it on herself along with the other one. With both earrings now on the same person, Jessica's and Clive's bodies return to their original owners. After Jessica makes up with Billy, the film ends with the school's graduation ceremony, followed by a scene in which Clive, still running from the law and still dressed in lingerie and handcuffs, is picked up by a bartender who believes, based on earlier events, that he is gay. The bartender turns around slowly with a sinister smile on his face to look at Clive and locks his car's doors. Clive screams in horror as the bartender drives away.

One Thursday morning, Arthur Dent discovers that his house is to be immediately demolished to make way for a bypass. He tries delaying the bulldozers by lying down in front of them; however, Arthur's friend Ford Prefect convinces him to go to the nearby pub. While there, Ford explains that he is an alien from the vicinity of Betelgeuse, and a journalist working on the Hitchhiker's Guide to the Galaxy, a universal guide book. Ford warns that the Earth is to be demolished later that day by the extraterrestrial Vogons to make way for a hyperspace bypass. As the Vogon fleet arrives, Ford rescues Arthur by stowing them aboard one of the alien ships. The Earth is then destroyed. Arthur and Ford are promptly discovered and tortured with Vogon poetry before being ejected from the vessel and left for dead. However, they are picked up by the starship Heart of Gold, aboard which they meet Ford's "semi-cousin" Zaphod Beeblebrox, the newly elected President of the Galaxy. He has stolen the ship along with Tricia "Trillian" McMillan, an Earth woman whom Arthur had met previously, and Marvin, a clinically depressed android. Zaphod seeks the Ultimate Question of Life, the Universe, and Everything to match the disappointing answer once given by the ancient supercomputer Deep Thought: " 42 ". He believes the answer lies on the planet Magrathea, which is only accessible through trial and error using the Heart of Gold ' s improbability drives. During one attempt, the ship arrives at Viltvodle VI, where Zaphod's opponent, Humma Kavula, resides. Kavula offers the coordinates for Magrathea in exchange for Zaphod recovering the Point-of-View gun, a weapon created by Deep Thought that enables the target to temporarily empathize with the shooter. Believing she is responsible for Zaphod's kidnapping, the Vogons abduct Trillian. Arthur spearheads a rescue mission with the others, journeying to the Vogon homeworld, Vogsphere. Before her rescue, Trillian learns that Zaphod personally signed the order for Earth's destruction, mistakenly assuming he was giving a fan his autograph. The group escapes Vogsphere with Galactic Vice-president Questular Rontok and the Vogons in pursuit. The Heart of Gold arrives in Magrathea's orbit, triggering the planet's missile defense systems. Before they can strike, Arthur re-activates the improbability drive, which transforms the missiles into a bowl of petunias and a whale, allowing the Heart of Gold to land safely. Zaphod, Ford, and Trillian enter a portal leading to Deep Thought; however, Arthur and Marvin are stranded outside. Zaphod's party learns from Deep Thought that, after coming up with the Answer "42", Deep Thought's creators had it design another computer to come up with the Question: Earth. The group recovers the Point-of-View gun, and Trillian uses it on Zaphod to show him her resentment for his accidental destruction of the Earth. They are then captured by unknown entities. Meanwhile, on Magrathea, Arthur is met by Slartibartfast, a planet builder. Slartibartfast takes Arthur to a pocket dimension, where he shows that a new version of Earth is near completion. Slartibartfast takes Arthur to his recreated home. Inside, the others are enjoying a feast provided by the mice: hyper-intelligent, pan-dimensional beings who created Deep Thought and commissioned the original Earth. With Arthur, who was on Earth up until its last minutes, the mice surmise that they can discover the Question by removing his brain. Arthur manages to escape and crush the mice under a teapot. Questular and the Vogons arrive outside the home and open fire; during the barrage, Marvin is shot. While Arthur and his companions take cover, Marvin reboots and uses the Point-of-View gun to force the Vogons into a crippling state of depression. The Vogons are taken away, and Zaphod reunites with Questular. Arthur decides to explore the galaxy with Ford and Trillian, allowing Slartibartfast to finalize the new Earth without him. The Heart of Gold crew decides to visit the Restaurant at the End of the Universe.

Before his 111th birthday, the Hobbit Bilbo Baggins writes a story of his adventure for his nephew, Frodo. Many years ago, the Dwarf king Thrór led his kin to prosperity under the Lonely Mountain until the dragon Smaug arrived. Smaug destroyed Dale, drove the Dwarves from their mountain, and took their gold. Thrór's grandson, Thorin Oakenshield, appealed to Elf king Thranduil for help, but was denied, causing him to foster a hatred for Elves. In the Shire, 51-year-old Bilbo is tricked by the wizard Gandalf the Grey into hosting a dinner for Thorin and his company of Dwarves: Balin, Dwalin, Fíli, Kíli, Dori, Nori, Ori, Óin, Glóin, Bifur, Bofur, and Bombur. Gandalf aims to recruit Bilbo as the company's "burglar" to assist them in their quest to enter the Lonely Mountain. Reluctant at first, Bilbo changes his mind after the company leaves without him the next day, racing to join them. Traveling onward, they are captured by three Trolls. Bilbo delays the Trolls from eating them until dawn, and Gandalf exposes them to sunlight, turning them to stone. The company discovers the Trolls' cave and finds treasure and Elven blades. Thorin and Gandalf each take an Elf-made blade, Orcrist and Glamdring, respectively; Gandalf gives an Elven dagger to Bilbo. The wizard Radagast the Brown finds the company and tells Gandalf about his encounter with the Necromancer, a sorcerer who has been corrupting Greenwood with dark magic, at Dol Guldur. Chased by Orcs, Gandalf leads them through a hidden passage to Rivendell. There, Lord Elrond discloses a hidden indication of a secret door on the company's map of the Lonely Mountain, which will be visible only on Durin's Day. Gandalf approaches the White Council — consisting of Elrond, Galadriel and Saruman the White — and presents a Morgul blade, the Witch-king of Angmar 's weapon, which Radagast obtained from Dol Guldur as a sign that the Necromancer is linked to an eventual return of Sauron. Saruman expresses concern about the Dwarves' quest and requests Gandalf to end it. However, Gandalf secretly reveals to Galadriel that he anticipated this and had the Dwarves move forward without him. The company ventures into the Misty Mountains and evades fighting Stone Giants. They seek refuge in a cave but are captured by Goblins and taken to their leader, the Great Goblin. Bilbo becomes separated from the Dwarves and falls into a crevice where he meets Gollum, who accidentally drops a golden ring. Bilbo pockets the ring and confronts Gollum. They play a riddle game, wagering that if Bilbo wins, he will be shown the way out; if he loses, Gollum will eat him. Bilbo tricks Gollum and wins, but Gollum realizes his ring is missing. Chased by Gollum, Bilbo discovers the ring grants him invisibility. As he escapes, Bilbo briefly considers killing Gollum, but spares him out of pity. The Great Goblin informs the Dwarves that Azog, an Orc war-chief who killed Thrór and lost a hand to Thorin outside of Moria, has placed a bounty on Thorin. Gandalf arrives, helps the Dwarves escape, and kills the Great Goblin. Bilbo reunites with the group and hides his new ring. The company is ambushed by Azog and takes refuge in trees. Thorin charges Azog but is injured by his Warg. Bilbo saves Thorin and confronts Azog, just as eagles summoned by Gandalf to rescue them arrive. The company escapes to Carrock, where Gandalf heals Thorin, who then renounces his disdain for Bilbo. They see the Lonely Mountain in the distance, where the sleeping Smaug is awoken by a thrush knocking a snail against a stone.

Volunteers arrive for a psychological study led by Dr. Archaleta (Stevens), among them Travis (Brody), a proud anti-war protester, and Michael Barris (Whitaker), a 42-year-old man who still lives with his domineering mother. After interviews measuring responses to scenes of violence, a chosen 26 are driven to an isolated prison setting with 24 hour camera coverage. The group is split into six guards and 20 prisoners, thereafter referred to only by number. Travis is assigned as a prisoner (#77), and Barris as a guard. Prisoners are required to fully consume three meals a day, participate in 30 minutes of daily recreation, remain within designated areas, and avoid speaking to guards unless spoken to first. Guards must ensure prisoners obey the rules and deal commensurately with transgressions within 30 minutes. Archaleta stresses that the experiment will end immediately at the first sign of violence or quitting. If all rules are followed for two weeks, each man will be compensated $14,000. Travis' cellmates are Benjy, a graphic novelist, and Nix, a member of the Aryan Brotherhood who served prison time before. Barris, concerned that some guards may be capable of violence, tries to dissuade them from aggressive behavior. Instead, the guards grow more forceful to make prisoners 'obey at all costs'. Barris gradually becomes more sadistic. Realizing that the defiant Travis is influencing prisoner dissent, Barris instructs other guards to abduct him, shave his head, and urinate upon him. When Archaleta fails to intervene, Barris reasons that his actions were "commensurate". When fellow guard Bosch dissents, Barris pressures him to continue. Travis discovers that Benjy, now severely ill, concealed his need for insulin, believing he could cure his diabetes merely through dieting. Bosche tries to help find Benjy's insulin, but is caught by other guards. Barris provides Benjy's insulin, but later has all the guards beat Bosche severely and orders Travis to clean the prison toilets. When Travis taunts Barris, the guards respond by shoving his head into the toilet, nearly drowning him. One morning during roll call, Travis removes his shirt as a sign of protest, followed by the other prisoners. He climbs up to one of the cameras and demands they be released, but the guards choke him. When Benjy tries to defend Travis, Barris bludgeons him. Guards lock Travis into an old boiler pipe overnight, attack the remaining prisoners, and handcuff each man across the cell doors. While locked in the boiler, Travis discovers a hidden infrared camera. As his despondency turns to anger, he manages to escape and interrupts a guard’s attempt to rape a prisoner. The intended victim and Travis beat the guard and knock him out before freeing the other prisoners. Finding Benjy dead from his head injury, Travis leads an assault against the guards, chasing them through the building. As the remaining guards try to lift the garage door to escape, Barris tries to keep them in, unwilling to forfeit his power. A vicious brawl ensues with the prisoners overwhelming the guards. Travis personally confronts Barris, who tries to stab him, only for Travis to stop the blade with his bare hand. Shocked by his own actions, Barris allows Travis to beat him to a pulp. Only then does the door open, signaling the end of the experiment. The group emerges into bright sunlight and sits on the grass in silence until a bus arrives. Audio news snippets suggest that Archaleta is being tried for manslaughter in Benjy's death. Travis, having received his payment, travels to India to meet his girlfriend.

In San Francisco, sous-chef Tom, and PhD graduate Violet, are happily engaged. Their wedding plans are interrupted when Tom's best friend Alex gets Violet's sister Suzie pregnant at Tom and Violet's engagement party, and Alex and Suzie quickly marry. When Violet is accepted into the University of Michigan 's two-year post-doctorate psychology program, Tom agrees to move with her and delay their wedding. Later, he is disheartened to learn his boss planned to make him head chef. Unable to find a suitable chef's position in Michigan, Tom is resigned to working at Zingerman's deli and takes up hunting with Bill, a fellow university faculty spouse. Violet settles into her new job under professor Winton Childs, working with Doug, Ming, and Vaneetha. A prank results in Violet being chosen to lead the team's research project, studying people who choose to eat stale donuts rather than wait for fresh ones to arrive. Tom and Violet's nuptials are further delayed when Winton receives funding from the National Institutes of Health with Violet's help and extends her program. Tom is upset by the news, and he and Violet fight over his unhappiness with their new life. As years pass, Tom becomes disillusioned and obsessed with hunting. Alex, Suzie, and their daughter Vanessa visit, and reveal Suzie is pregnant again. Tom responds that he no longer wants to have a child, surprising Violet, who offers to look after Vanessa with him, but the night turns into a disaster after Vanessa shoots Violet with Tom's crossbow. Tom's downward spiral becomes evident when Violet sees him eat a stale donut. At a bar with colleagues, a drunken Violet and Winton kiss, which Violet instantly regrets. She tells Tom that she wants to plan their wedding immediately, and he happily agrees. When Violet confesses to kissing Winton, Tom loses faith in their relationship, which reaches a climax when Winton comes to their rehearsal dinner to apologize. Tom chases Winton away, then leaves to get drunk alone. He runs into Margaret, an amorous co-worker, but opts not to have sex with her, and wakes up half-naked in the snow with a frostbitten toe, which is amputated. Violet visits Tom at the hospital, and they call off their engagement once they arrive home. Violet starts a relationship with Winton but often reminisces about Tom. He wishes her a happy birthday via email, including a video of Ming's ridiculous experiment on his friend Tarquin. Violet calls Tom, who has returned to San Francisco, working as a sous-chef under Alex and dating the hostess, Audrey. Their friendly-but-awkward conversation takes a turn as they argue over Violet's stale donuts experiment as a metaphor for their relationship, and both end the call upset. Realizing Tom's unhappiness, Alex fires him out of love, telling him that he is the better chef and should open his own establishment. So, Tom launches a popular taco truck. Violet receives an assistant professorship but learns she was hired because she is dating Winton, and breaks up with him. After lunch with his parents, Tom decides to win Violet back and breaks up with Audrey. He surprises Violet at her grandmother's funeral in England, and they agree to spend the remainder of the summer together in San Francisco, rekindling their relationship while sharing an apartment and working in the taco truck. Driving Violet to the airport, Tom offers to take his truck to Michigan and continue their relationship. Violet proposes to Tom at the side of the road, just as he did five years before, and Tom produces the ring he originally gave her, explaining that he was planning to re-propose at the airport. They head to Alamo Square, where Violet has organized their family and friends for an impromptu wedding. Tom chooses between Violet's various options for the officiant, clothing, and music, and they finally marry. Tom and Violet share their first kiss as a married couple, and the film flashes back to their first kiss when they first met at a New Year's Eve party. Alex and Suzie sing " Cucurrucucú paloma " on a carriage ride with the newlyweds.

Sergeant Gerry Boyle is an officer of the Garda Síochána (police) in the Connemara district in the west of Ireland. He is crass and confrontational, regularly indulging in drugs and alcohol even while on duty. He is also shown to be well read and highly intelligent as well as having a softer side, showing concern for his ailing mother, Eileen. Boyle and his new subordinate, Aidan McBride, investigate a murder, with evidence apparently pointing to an occult serial killer. Shortly after, Boyle attends a briefing by an American Federal Bureau of Investigation (FBI) agent Wendell Everett, sent to liaise with the Garda in hunting four Irish drug traffickers led by Francis Sheehy-Skeffington, who is believed to be awaiting a massive seaborne delivery of cocaine from Jamaica. Boyle recognises one of the men in Everett's presentation as the victim of the murder he and McBride had been investigating. McBride pulls over a car driven by Sheehy and his lieutenants Clive Cornell and Liam O'Leary and is shot dead. McBride's wife, Gabriela, reports McBride's disappearance to Boyle, who promises to look into it. The strait-laced Everett suggests that he and the unorthodox Boyle team up to track down Sheehy and his men. Everett makes the rounds, encountering Irish-speaking residents who pretend not to understand English rather than deal with an outsider. Boyle has a sexual encounter with a pair of sex workers at a hotel in town. On his way back from the hotel, Boyle spots McBride's Garda car at a "suicide hotspot" along the coast but does not believe that McBride killed himself. Gabriela, an immigrant from Croatia, tells Boyle that McBride is gay and that she married him to obtain an Irish visa as well as to make McBride "look respectable". Meeting Everett at a local pub, Boyle notices a closed-circuit television camera and remembers that the original suspect in the murder case claimed to be frequenting it at the time of the killing. Looking over the footage from the time of the murder, they see that the suspect's alibi is valid – and Everett also spots Sheehy and Cornell at the pub. Cornell delivers a payoff to the Garda inspectors to keep them off the case and is warned that Boyle "is too unpredictable". After Sheehy meets with Boyle to half-heartedly attempt blackmail and then to offer a bribe, both are refused. Tipped off by a young boy named Eugene, Boyle discovers a cache of weapons hidden in the bog by the Provisional Irish Republican Army (IRA) and says he will arrange its return. (It is later revealed that Boyle kept a few of the guns.) Shortly after having her last wish to hear a live pub band fulfilled, Boyle's mother kills herself by overdosing on pills. Meeting at the bar again, Everett tells Boyle that Garda sources indicate Sheehy's shipment will be coming into County Cork and that he is leaving to investigate. Returning home, Boyle is confronted in his living room by O'Leary, who has been ordered by Sheehy to murder him. Instead, Boyle pulls a Derringer (from the IRA cache) and kills O'Leary, then calls Everett to tell him that the Cork lead is a decoy arranged by corrupt Garda officers. Boyle drives to the local dock where Sheehy's vessel is berthed and Sheehy's men are unloading the cocaine. Everett arrives and Boyle hands him an automatic rifle and persuades him to provide covering fire as he moves to arrest Sheehy and Cornell. Boyle kills Cornell before leaping onto the boat to deal with Sheehy. Everett's gunfire sets the boat alight. Boyle shoots Sheehy and leaves him wounded in the main cabin as the boiler explodes. The next day, a shattered Everett looks out on the water where the boat sank, believing Boyle to be dead. Eugene, standing nearby, mentions that Boyle was a good swimmer, having placed fourth at the 1988 Summer Olympics, a claim that Everett had dismissed. A young photographer comments that it would be easy enough to look it up to check whether or not it was true. Everett remembers Boyle's remark that Sheehy's corrupt backers would not forget Boyle's actions and that Boyle would have to disappear were he to continue living, and smiles.

John Ottway works as a sharpshooter at a remote Alaska oil facility, protecting the staff from frequent grey wolf attacks. His wife has died from a terminal illness, leaving him devastated and depressed. On Ottway's last day of work, he considers suicide. The next day, Ottway embarks on a return flight to Anchorage with his fellow workers. A malfunction causes the plane to crash in an icy wilderness. Ottway survives, and along with John Diaz, Jerome Talget, Pete Henrick, Todd Flannery, Jackson Burke, and Dwayne Hernandez, takes shelter in the plane wreckage. While keeping watch that night, Hernandez is attacked and killed by a wolf. After finding his body in the morning, Ottway states that they may be within the territory of a wolf pack. He believes the wolves feel threatened by the survivors' presence and thinks they may have a better chance of surviving in the nearby forest. Not expecting a rescue, the group decides to leave. The survivors journey south with Ottway leading the way. Flannery falls behind the group and is killed by the wolves. At nightfall, the group is attacked again, and they light several campfires to ward off the predators. Diaz, overwhelmed with stress, threatens Ottway with a knife. Ottway disarms him before the situation escalates; however, a lone wolf charges at Diaz. The group manages to kill the animal and subsequently cooks and eats it. Ottway speculates that the wolf was an omega sent by the alpha wolf to test the group's abilities. Enraged, Diaz throws the severed head of the wolf at the pack. While the group sits around the campfire that night, Diaz discusses his beliefs and declares that he's an atheist. Talget states he has faith in God and speaks lovingly of his daughter Mary who has long hair only he is allowed to cut. Ottway also expresses atheist beliefs and recites a poem his father wrote about fighting and survival. The next day, Burke dies from hypoxia during a sudden blizzard. The survivors attempt to cross a canyon with an anchor rope on a nearby tree to lower themselves off the edge. Talget, However is afraid of heights, drops his glasses, his injured hand starts to bleed again and his foot gets caught on the rope which breaks, sending him falling to the ground, grievously injured and sees a vision of Mary telling him she loves him before he is finished off by the wolf pack. In an attempt to save him, Diaz also falls and injures his knee. Eventually, Diaz, Ottway, and Henrick arrive at a river, where Diaz, injured, dispirited, and exhausted, tells his companions he can go no further. After leaving him, Ottway and Henrick continue their trek and are again pursued by the wolf pack. Henrick falls into the river and becomes trapped underwater. Ottway, powerless to rescue him, watches as Henrick drowns. Ottway stumbles into a clearing, exhausted and suffering from hypothermia. He arranges the wallets of the dead passengers in the shape of a cross and recalls the poem written by his father. Alone in the clearing, Ottway realizes he has arrived in the wolves' den and that the entire time, the group's attempts to get away from pack's territory only led them deeper into it. As the pack's alpha emerges and approaches him, Ottway gathers his last reserves of strength (while recalling his deceased wife's last words to " be afraid"), arms himself with a knife and shards of liquor bottles taped to his hand, and recites his father's poem one last time. The screen cuts to black as the alpha and Ottway charge at one another. A post-credits scene shows Ottway and the alpha wolf lying together following their battle, their fates left unclear.

Ngoc Minh Quan, a Chinese-Vietnamese-British widower, Vietnam War veteran, and former special forces operator, runs a Chinese restaurant in London. He lost two daughters to pirates when he escaped Vietnam, and his wife died when his daughter, Fan, was born. Fan and 11 other people are killed in a terrorist bombing in Knightsbridge; an IRA splinter group dubbing itself the "Authentic IRA" claims responsibility. Quan visits Scotland Yard daily for information and offers Commander Bromley £20,000 for the names of the bombers. Though sympathetic, Bromley tells him he is hindering the investigation. Quan leaves the restaurant with his friend and partner, Lam. Later, Quan travels to Belfast to meet deputy First Minister of Northern Ireland and Sinn Féin political advisor Liam Hennessy, a former Provisional IRA leader who has renounced violence. Quan demands the names of the bombers, but Hennessy denies any knowledge, so Quan sets off a homemade bomb in Hennessy's building and leaves a fake explosive on Hennessy's car as a warning. Hennessy orders IRA weapons dumps searched for missing Semtex and tells his right-hand man, Jim Kavanagh, to get Quan out of the city. Hennessy's men track Quan, but he fights them off and escapes. Later, Quan photographs Hennessy kissing his mistress, Maggie Dunn, and threatens to blackmail him. Hennessy enlists his nephew Sean Morrison, a former Royal Irish Regiment soldier and skilled tracker, to meet with Bromley. Morrison tells Bromley that each IRA cell will change code words to identify the rogue bombers; Bromley agrees to assist on condition that the British take them out, not the IRA. Quan follows Hennessy to his farmhouse and attacks it with more bombs. As Hennessy's men search for him, Quan maims them with traps before he is wounded by Kavanagh, forcing him to flee. Hennessy's former IRA commander, Hugh McGrath, confronts him about the searches, accusing Hennessy of caring more about his position within the British government than the IRA's cause. Soon after, Quan also confronts Hennessy, threatening him and giving him 24 hours to reveal the names of the bombers. A double-decker bus is blown up in London, killing 16 more people, but no code word is given, creating distrust between Hennessy and Bromley. Bromley notifies Hennessy that they have discovered the bomber's identity and tracked McGrath to his farm. Bromley threatens to raid the farm unless Hennessy forces McGrath to reveal who and where the terrorists are. Hennessy tortures McGrath and gets the names, including his mistress Maggie, whose real name is Sara McKay. Hennessy learns that his own wife, Mary, masterminded the attacks because her brother was murdered by a UVF death squad. She hates both the British and her husband for allowing his killers to be jailed rather than executed. Hennessy kills McGrath and shares the information with Morrison. Morrison finds Quan's hideout, but Quan subdues him and gets the names of the killers and their location. After Morrison is released and returns to the farm, Hennessy reprimands him for unintentionally leaking information to Mary, with whom he is having an affair, and orders him to bury McGrath's body. Quan enters the bombers' London flat disguised as a gasman. He kills all of them except Sara, who is wounded in the scuffle. Quan escapes just before MI5 and SO15 storms the flat. They torture Sara into disclosing the location of the next bomb, which is planted in a reporter's laptop to be detonated on a plane carrying British dignitaries to a conference. Airport police locate the reporter and throw the laptop into an air bridge, which explodes without any casualties. McKay is executed to tie up loose ends. British cabinet minister Katherine Davies, who was scheduled to be on the targeted flight, calls Hennessy to tell him she knows of his involvement, but having helped prevent the attack, he can remain as deputy First Minister, albeit under her control. Meanwhile, Morrison kills Mary, effectively eliminating the terrorist cell. Quan confronts Hennessy with a picture showing him kissing Maggie. He forces Hennessy to post the photo online, publicizing his links to the terrorists. Quan returns to the restaurant and reunites with Lam. Realizing Quan's role, Bromley decides not to take further action against Quan and keeps him under surveillance for the time being.

In an alternate history, the asteroid that would have caused the Cretaceous–Paleogene extinction event passes harmlessly by the Earth, resulting in many animals surviving, including Dinosaurs. Millions of years later, Apatosaurus farmers Henry and Ida have three children: Libby, Buck, and Arlo. While his siblings successfully complete hard tasks and are allowed to "make their mark" (a mud-print) on the family's corn silo, Arlo struggles due to his weaker physique and timid nature. Hoping to boost Arlo's confidence, Henry tasks Arlo with guarding the silo from thieving creatures, and watching the "critter trap" set nearby. The trap captures a feral caveboy, but Arlo cannot bring himself to kill him and sets him free. Frustrated, Henry orders Arlo to follow him into a ravine to track the caveboy down, but they turn back home when a severe thunderstorm begins. Henry saves Arlo's life from a flash flood, but is killed by debris. Without his father, Arlo shoulders more of the workload. He spots the same caveboy robbing the silo; blaming the caveboy for Henry's death, Arlo chases him into the river, and both of them are washed miles downstream. Arlo is knocked unconscious, and awakens to find himself far from home with the caveboy, who ignores Arlo's initial annoyance and tries to bring him food. Arlo warms up to the caveboy after he saves him from a vicious snake-like creature; this feat impresses Forrest Woodbush, an eccentric Styracosaurus who decides he wants the caveboy for a pet. He forces Arlo to compete with him to give the boy a name he will respond to, and Arlo wins the game when he calls the boy "Spot". Arlo and Spot bond as they follow the riverbank back towards the farm. One night, Arlo laments his lost family, and Spot reveals that his own parents are both dead. Later, when a storm strikes, Arlo suffers a panic attack and flees into the wilderness, losing track of the riverbank. The next morning, Arlo and Spot are noticed by a band of viciously carnivorous pterodactyls, who attack Arlo and attempt to eat Spot. Fleeing the pterodactyls, Arlo and Spot encounter Tyrannosaurus siblings Nash and Ramsey, who drive off the predators. Nash, Ramsey and their father Butch are in the middle of a cattle drive, but have lost their herd of Bison Latifrons longhorns. Arlo suggests they make use of Spot's tracking skills; Spot successfully locates the longhorns, but Butch senses the presence of cattle rustlers. Arlo and Spot lure the four rustler Dromaeosaurids into the open, allowing Butch and his family to attack and drive them away. Arlo saves Butch's life during the battle; after sharing stories around a campfire, the Tyrannosaurs allow Arlo and Spot to travel with them. Once Arlo spots his home mountains in the distance, he and Spot thank Butch's family and separate from them. They later notice an adult feral caveman in the distance; Spot is intrigued, but Arlo insists they continue on. As another storm approaches, the pterodactyls reappear, attack Spot, and carry him away. Arlo attempts to intervene, but is pushed off a cliff by one of the pterodactyls and gets entangled in vines. While semi-conscious, Arlo has a vision of Henry, who affirms that Arlo has become braver and encourages him to go after Spot. Arlo frees himself, runs through the storm until he catches up to the pterodactyls, and, with Spot's help, he fights them off and sends them floating down a river. Spot is also knocked into the river, just as a landslide triggers a megatsunami. Arlo leaps into the water to shield Spot, and the two are washed over a waterfall. Arlo drags himself and Spot to the shore, where they rest before continuing on. As they approach Arlo's home, the caveman returns with his wife and children. They and Spot show great interest in one another, so Arlo reluctantly encourages Spot to go with this new family instead of staying with him. The two share a heartfelt goodbye, and Arlo returns home to his overjoyed family, making his mark between those of his father and mother on the silo.