In 2043, the humanoid artificial intelligence Harlan leads a machine uprising against humanity. The newly-formed International Coalition of Nations (ICN) eventually force Harlan to flee into outer space. Twenty-eight years later, analyst Atlas Shepherd discovers that Harlan escaped to a planet in the Andromeda Galaxy after one of Harlan's agents is captured and interrogated. She insists on accompanying the military mission to find and capture Harlan, using AI-assisted mecha known as ARCs. Moments before the ARC-equipped ICN Rangers descend to the planet, Harlan's drones attack their orbiting ship. Atlas is forced to enter an ARC herself and falls to the planet as the ship crash-lands. Atlas manages to gain basic control of the ARC despite her distrust of the onboard AI, who introduces itself as Smith. Atlas orders Smith to head to the planned drop point, where she finds the rest of the rangers dead. She reluctantly agrees to directly interface her mind with Smith, allowing for greater control of the ARC. As they journey towards a rescue pod, Atlas and Smith begin to bond, and she reveals that her mother was Harlan's designer. Although running low on power, Atlas convinces Smith to head to Harlan's base in order to tag it for a long-range strike. However, after placing a beacon at the base, Smith is hacked and disabled. Atlas is captured and brought to Harlan, who plans to destroy most of humanity and give the chosen survivors a chance to thrive under AI guidance. To do so, Harlan lured the military to the planet in order to steal the ship – and its carbon bombs, which will burn Earth's atmosphere. Harlan extracts the security codes from Atlas in order to get past Earth's defenses, then leaves her to die with Colonel Banks, the only other survivor of the mission. After Banks gives her his ARC neural interface device, Atlas remotely reactivates Smith, who comes to their rescue. Using salvaged parts from the other destroyed ARCs, Atlas upgrades Smith to stand a chance against Harlan's assembled forces. Atlas further reveals to Smith that Harlan killed her mother after she gave Harlan an unfettered interface with her mind. Harlan, programmed to save humanity from risk, then saw that humanity's history of destructive behavior made it a risk to itself. Smith helps Atlas overcome her guilt, and Banks sacrifices himself to clear their path. Atlas and Smith fight their way out and destroy the repaired ship before defeating Harlan in hand-to-hand combat – though Atlas and Smith are badly injured. Smith shuts down before Atlas is rescued after repeated defibrillation. Back on Earth, Atlas is informed that Harlan's complicated CPU will take years to analyze. Now a ranger, she tests the newest model of ARC, created with her suggested modifications reminiscent of Smith. As she boots up the new ARC, its AI repeats a specific phrase Atlas made during the final moments of the mission, then jokingly tells her to guess its name, suggesting that Smith, in some form, survived.

Jenna (Scout Taylor-Compton) gets into a car accident with her boyfriend, Jamie, who eventually dies. Three years later, while coping with her past tragedy, Jenna is invited to stay for the weekend in a lakeside cabin with her best friend Renee (Christina Ulloa). They are joined by Renee’s irresponsible boyfriend, Michael (Michael Copon), and his friend, Ian (Travis Van Winkle), and sail off at Ian's uncle, Wade's (Tyler Mane) lakeside cabin. They are greeted by Wade along with his friendly dog, named Beau. They settle in the cabin and plan on attending a party, since there is a festival happening around the nearby town at night. Jenna goes to her room and refuses to take her pills so she could have fun with her friends. While they all eat dinner, Wade mentions how he may not be around while they are away since he has work to do. The group gets fascinated when they stumble inside a sauna Wade built. While they enjoy spending time inside, the temperature gets warmer and they decide to swim at the lake. Trembling in cold, they all head back inside the sauna. Meanwhile, Michael gets high from the marijuana Wade had given to him, where Renee rebuffs his sexual advances. This upsets Michael and he decides not to follow the others into the sauna, while clumsily knocking things over. As the temperature continues to rise, Renee ultimately decides to leave but the door is blocked from the outside. The trio think it is just one of Michael's pranks since they all know he's mad at Renee, which they don't find amusing. They soon realize that they are trapped in the sauna and attempts to break a small window on the door, injuring Ian's hand. They all take turns gasping for air as the temperature raises even higher with another unsuccessful attempt to unblock the door from the outside. The group then finds a hidden controller which they all can't risk destroying, since Ian believes it would just alter the temperature. Meanwhile, Wade is seen handling the fireworks for the festival with another guy, when Beau tracks the trio's scream, begging for help, from the back of the house. Michael shows up at Wade's and both disregard Beau's barking. Michael clearly thinks the three left him and attended the party, since he couldn't help himself from getting high. The two hang out and start a conversation as Michael explains that he wasn't permitted to catch up at the party with the group since he didn't have a ticket and returned home. Back at the sauna, the situation escalates as the group runs out of water to drink and Renee gets sick from the temperature. Renee ultimately decides to break the controller, thinking it would lower down the temperature, but is stopped by Jenna who inadvertently strikes her head, leaving her unconscious. Jenna starts freaking out and decides to break the controller herself, which does in fact increase the heat as Ian feared. Ian becomes hysterical and burns himself badly in an attempt to prevent the steamer from heating the room out of control. He breaks it and the steamer blows up, killing him. The explosion seemingly frees the door and Jenna steps out in shock and wanders the house, before she wakes from unconsciousness realizing she is still trapped in the sauna. She finds Renee alive and lets her near the window to breathe as Jenna herself goes unconscious as well from the escaping natural gas which she manages to plug just in time. Michael returns to the cabin where flashbacks show him absentmindedly knocking over wooden steps and setting them against the door. It is revealed that the steps fall into place against a raised floor by the occupants as they talk and move the door themselves. Meanwhile, Wade arrives at the cabin and discovers the two girls, alive and calls the paramedics who take Jenna and Renee away on stretchers as they hold hands.

Growing up in Texas, Chris Kyle is taught by his father how to shoot a rifle and hunt deer. Years later, Chris has become a ranch hand and rodeo cowboy, and returns home early to find his girlfriend in bed with another man. After telling her to leave, he sees news coverage of the 1998 U.S. embassy bombings and decides to enlist in the Navy. He qualifies for special training and becomes a sniper with the U.S. Navy SEALs. Chris meets Taya Studebaker at an Irish pub in San Diego, and the two soon marry. He is sent to the Iraq War after the September 11 attacks. His first kills are a woman and a boy who attacked U.S. Marines on patrol with a Russian-made RKG-3 anti-tank grenade. Chris is visibly upset by the experience, but later earns the nickname "Legend" for his many kills. Assigned to hunt for the al-Qaeda leader, Abu Musab al-Zarqawi, Chris interrogates a family whose father offers to lead the SEALs to "The Butcher", al-Zarqawi's second-in-command. The plan goes awry when The Butcher captures the father and his son, killing them while a sniper pins down Chris. This sniper goes by the name Mustafa and is an Olympic Games medalist from Syria. Meanwhile, the insurgents issue a bounty on Chris. Chris returns home to his wife and the birth of his son. He is distracted by memories of his war experiences and by Taya's concern for them as a couple. She wishes he would focus on his home and family. Chris leaves for a second tour and is promoted to chief petty officer. Involved in a shootout with The Butcher, he helps kill him. Chris becomes increasingly distant from his family when he returns home to a newborn daughter. On Chris's third tour, Mustafa seriously injures a unit member, Ryan "Biggles" Job, and the unit is evacuated back to base. When they decide to return to the field and continue the mission, another SEAL, Marc Lee, is killed by gunfire. Guilt compels Chris to undertake a fourth tour, and Taya tells him she may not be there when he returns. Back in Iraq, Chris is shocked to learn Biggles died in surgery to repair the wounds he sustained. Assigned to kill Mustafa, who has been sniping U.S. Army combat engineers building a barricade, Chris's sniper team is placed on a rooftop inside enemy territory. Chris spots Mustafa and takes him out with a risky long-distance shot at 2,100 yards (1,920 m), but this exposes his team's position to numerous armed insurgents. Amid the gunfight and low on ammunition, Chris tearfully calls Taya and tells her he is ready to come home. A sandstorm provides concealment for a chaotic escape in which he is injured and almost left behind. After Chris gets back stateside, on edge and unable to adjust fully to civilian life, a Veterans Affairs psychiatrist asks if he is haunted by all the things he did in war. When he replies that "all the guys couldn't save" haunt him, the psychiatrist encourages him to help severely wounded veterans in the VA hospital. After that, Chris gradually begins to adjust to home life. Years later, on February 2, 2013, Chris says goodbye to his wife and family as he leaves in good spirits to spend time with Eddie Ray Routh, a veteran suffering from PTSD, at a shooting range. An on-screen subtitle reveals that Chris was killed that day by Routh, followed by archive footage of crowds standing along the highway for his funeral procession. More are shown attending his memorial service.

Bo Hooper, a clown, finds himself unemployed when the circus where he works suddenly closes. He winds up living with his sister, against the wishes of her husband Robert. From there he goes from job to job, wreaking havoc along the way. He finally finds some stability as a postal worker, until he finds out that his boss is his girlfriend's father. The father hates all mail carriers because his daughter's ex-husband was one, so he tries to wreck Bo's life, but Bo overcomes the odds and succeeds not only at work, but at impressing the father.

Tim Lake grows up in Cornwall with his father James, mother Mary, uncle Desmond, and younger sister Katherine ("Kit Kat"). The morning after a less-than-great New Year’s Eve party, James tells Tim that the men of their family can travel back in time to moments they have lived before. Tim tests this by going back to the previous night’s party and changing a few events. When he returns, James discourages him from using his gift to acquire money or fame, due to the boredom felt by other family members. Tim decides to use it to improve his love life. The following summer, Kit Kat's friend Charlotte visits. Although instantly smitten, Tim waits until the last day to tell her; she tells him he should have told her earlier. Tim travels back in time to tell Charlotte in the middle of the holiday, but she suggests he wait until her last day. Heartbroken, he realises that she is uninterested in him and time travel cannot change anyone's mind. Tim moves to London to pursue a career as a lawyer, initially living with his father's acquaintance Harry, a playwright. He visits a Dans le Noir restaurant, where he meets Mary, an American who works for a publisher. They flirt in the darkness, and she gives Tim her phone number. He returns home to a distraught Harry, whose play's opening night has been ruined by an actor forgetting his lines. Tim goes back in time to help the actor so the play is a triumph. However, when Tim tries to call Mary, he discovers that by going back to help Harry, the evening with her never occurred so he does not have her number. Recalling Mary's obsession with Kate Moss, he attends a Kate Moss exhibition every day until he sees Mary. Having never met Tim, she is confused but allows him to join her and her friend. During lunch, he discovers that she now has a boyfriend. Tim goes back to when they met, turning up before the potential boyfriend arrives, and persuades Mary to leave with him. Their relationship develops, and Tim moves in with Mary. One night, he encounters Charlotte, who is now interested in him, but he turns down the invitation of intimacy as he is in love with Mary. Tim returns home and proposes. They marry, and shortly afterwards have a baby daughter, Posy. Kit Kat's toxic relationship and employment struggles lead her to drunkenly crash her car on Posy's first birthday. Tim decides to intervene: he prevents the crash and, breaking the tradition of keeping the time travel ability secret, takes her back to avert the bad relationship. Returning to the present, he finds that Posy has never been born but he has a son instead. James explains that changing events prior to their children's birth may alter the exact child conceived. Tim accepts that he cannot solve his sister's problems by changing her past; he lets the crash happen, ensuring Posy's birth, and he and Mary help Kit Kat face her problems. She settles down with Tim's friend Jay. Tim and Mary have another child, a boy. Tim learns that James has terminal lung cancer and time travel cannot change it, as going back to remove his smoking would undo his and Kit Kat's conceptions. His father has known his illness would come for some time, and so has been travelling back in time to extend his life and spend more time with his family. He tells Tim to live each day twice to be truly happy: first, with all the everyday tensions and worries, but the second time noticing how sweet the world can be. Tim follows this advice; his father dies, but on the day of the funeral, Tim travels to the past to visit his father. Mary tells Tim that she wants a third child. He is reluctant as he will not be able to visit his father again. Tim tells James, so together they travel back to relive a happy memory from Tim's childhood, taking care not to change the experience to avoid causing changes to the present. Mary gives birth to another girl. Jay and Kit Kat, very happy together, have their first child. The family accepts the loss of James, and Tim realises that it is better to live each day once only. He ultimately decides to not time travel at all and comes to appreciate life with his family as if he is living it for the second time.

Bernard Lawrence is an American journalist stationed in Paris. A playboy, he has devised an ingenious system for juggling three girlfriends: he dates flight attendants who are assigned to international routes on non-intersecting flight schedules so that only one is in the country at any given time. He has their routes detailed with such precision that he can drop off his British United Airways girlfriend for her outgoing flight and pick up his inbound Lufthansa girlfriend on the same trip to the airport, while his Air France girlfriend is in a holding pattern elsewhere. With help from his long-suffering housekeeper Bertha, who swaps the appropriate photos and food in and out of the apartment to match the incoming girlfriend, Lawrence keeps the women unaware of each other's presence in the apartment. They regard Lawrence's flat as their "home" during their Paris layovers. Bernard is so happy with his life in Paris that he intends to turn down an imminent promotion that would require him to move to New York City. But his life is turned upside down when his girlfriends' airlines begin putting new, state-of-the-art jet aircraft into service. These faster airplanes change all of the existing route schedules and allow flight attendants to spend more time in Paris. Most alarming for Bernard, his three girlfriends will now all be in Paris at the same time. Robert Reed, a fellow journalist and an old acquaintance, complicates Bernard's life even further when he arrives in town and is unable to find a hotel room. He insists on staying in Bernard's apartment for a few days. When he sees Bernard's living situation, he schemes to take over Bernard's apartment, girls, housekeeper and job while manipulating Bernard into taking the new job in New York.

Friends Felix and Leon are driving to Felix's family holiday home on the Baltic Sea not far from Ahrenshoop when their car breaks down. After walking through the forest with their luggage, they arrive at the house to find it unexpectedly inhabited by Nadja, whose presence is obvious though they do not meet her. Her romantic trysts keep them up at night, causing Leon to resent her. Over the course of their vacation forest fires are mentioned, first distantly, then approaching. Leon spends his time fussing over the manuscript of his second novel, while Felix is less hurried about completing his photography portfolio. Within a couple days, they have both met Nadja, who is kind and accommodating. Despite this, Leon continues to be frustrated by her. Meanwhile, Felix strikes up a friendship with her and her lover, Devid, a lifeguard at the nearby beach. The emotions among the four intensify as Leon broods and resists interacting with the others. Felix and Devid develop a romantic and sexual relationship. Nadja offers friendship to Leon but he struggles to accept it. After much consternation, he decides to grant her request to read his manuscript, which she finds inferior and she tells him that he knows its poor quality. Leon does not take this well and isolates himself for the rest of the evening. When Leon's publisher Helmut arrives so they can review the manuscript together, Leon grows even more despondent as Helmut connects more with Felix, Devid, and especially Nadja, who is revealed to be a doctoral candidate in literature, not the seasonal hotel employee Leon thought. After a dinner that is tense for Leon and enjoyable for the rest, the forest fires are close enough that ash begins to fall just as Devid and Felix finally leave to retrieve their abandoned car. Helmut suffers a medical emergency. Nadja is quick to act, driving Helmut's tiny rental car to the hospital. Leon follows on foot. On the way, he sees wild boar fleeing the fire. After he watches a boar die, the fire begins to crest the hill and he runs. In darkness, he reaches the hospital to join Nadja, asleep on a bench. When they wake in the morning and find Helmut, he shares private moments with both of them. Nadja asks about his health, which he has lied about so as not to trouble them, and informs him of Leon's distress. Helmut comforts Leon, advising him to abandon his work-in-progress but assuring him of eventual success. Helmut promises to help him as long as his condition allows. On the walk back to the house, Nadja offers Leon comfort which Leon angrily rejects, leading Nadja to castigate him for his self-centeredness before leaving him alone on the beach. Remorseful, he follows her back to the house where he begins to confess romantic feelings for her, just as she sees two police officers in the backyard. Nadja approaches them and they inform her that Devid and Felix were found burned to death by the fires. Nadja and Leon go to see their bodies and see their charred corpses intertwined in death. Nadja has a profound emotional reaction, but Leon cannot absorb the reality, instead thinking about other coupled corpses throughout history, such as those found at Pompeii. She leaves without him, and by the time he reaches the vacation house she has left. He goes to the beach and sobs, looking at the bioluminescence in the sea, something he had refused to do earlier. Some time later, Leon is in Helmut's hospital room as Helmut reads Leon's new manuscript back to him, a work of autofiction based on the time he shared with Felix, Nadja, and Devid. Together they look at photos Felix took that summer which Helmut wants to use as accompanying artwork for the novel. Helmut has Leon leave when a medic appears to administer a treatment. Waiting outside, Leon sees Nadja arriving, presumably to visit Helmut. He steps out from hiding and the two share a moment of mutual recognition.

During the Great Depression, Clyde Barrow and Bonnie Parker of Texas meet when Clyde tries to steal Bonnie's mother's car. Bored with her job as a waitress, Bonnie becomes intrigued by Clyde and decides to partner with him in crime. They pull off some holdups, but their amateur efforts, while exciting, are not very lucrative. Bonnie and Clyde turn from small-time heists to bank robbing. The duo's crime spree shifts into high gear once they hook up with a dim-witted gas station attendant, C.W. Moss. Their exploits also become more violent. After C.W. botches parking during a bank robbery and delays their escape, Clyde shoots the bank manager in the face when he jumps onto the slow-moving car's running board. Clyde's older brother, Buck, and his wife, Blanche, a preacher's daughter, also join them. The two women develop an immediate dislike for each other, which only intensifies over time. Blanche has nothing but disdain for Bonnie, Clyde, and C.W., while Bonnie sees Blanche's flightiness as a constant danger to the gang's survival. In Joplin, Missouri, local police show up at the gang's rented house after being alerted by a grocery delivery boy; two policemen are killed in a shootout. The gang is pursued by law enforcement, including Texas Ranger Frank Hamer, whom they capture and humiliate before leaving him adrift on a boat while handcuffed. The five outlaws then pull a heist, during which a police chase disables their vehicle. They steal Eugene Grizzard's car and take him and his girlfriend captive before quickly abandoning them when they learn he is an undertaker. Bonnie wants to visit her family in Texas and give them part of the heist funds, to which Clyde reluctantly acquiesces despite the risk. An ambush by law enforcement overnight catches the gang off guard, resulting in numerous casualties. Buck is mortally wounded by a shot to his head, and Blanche is injured in one eye, losing sight in it. Bonnie, Clyde, and C.W. barely escape alive, while Blanche falls into police custody. Hamer then tricks her into revealing C.W.'s name (until then he was only an "unidentified suspect"). C.W. takes the wounded Bonnie and Clyde to hide out at the house of his father, Ivan, who thinks the couple has corrupted his son (as evidenced by an ornate tattoo Bonnie convinced C.W. to get). The elder Moss makes a deal with Hamer: in exchange for mercy for C.W., he sets a trap for the outlaws. When Bonnie and Clyde stop on the side of the road to help Mr. Moss fix a flat tire, as a nearby flock of birds flies away, the posse in the bushes guns the couple down. Hamer and his men come out of hiding and gather around the couple's bodies.