In 1981, a feather lands at a bus stop in Savannah, Georgia; Forrest Gump collects it, then recounts his life story to strangers on a bus bench. In 1950s Alabama, Forrest is fitted with leg braces to correct a curved spine. His mother runs a boarding house out of their home. Among their tenants is Elvis Presley, who incorporates Forrest's jerky dance movements into his performances. On his first day of school, Forrest befriends a girl named Jenny Curran. Forrest is often bullied because of his physical disability and low intelligence. While fleeing from several bullies, his leg braces break off, revealing Forrest to be a very fast runner. This talent allows him to receive a football scholarship at the University of Alabama in 1963, where he is coached by Bear Bryant, and witnesses Governor George Wallace 's Stand in the Schoolhouse Door, during which he returns a dropped book to Vivian Malone Jones. Forrest becomes a top kick returner, is named to the All-American team, and meets President John F. Kennedy at the White House. After graduating college in 1966, Forrest enlists into the U.S. Army where he befriends Benjamin Buford "Bubba" Blue, who convinces Forrest to go into the shrimping business with him after their service. They arrive in Vietnam in 1967 and serve with the 9th Infantry Division in the Mekong Delta. Their platoon is ambushed during a patrol. Despite being shot, Forrest saves several wounded platoon mates – including his lieutenant, Dan Taylor, who has suffered severe leg injuries – but Bubba is killed. Forrest is awarded the Medal of Honor for his heroism by President Lyndon B. Johnson. At the anti-war March on the Pentagon rally, Forrest meets Abbie Hoffman and briefly reunites with Jenny, who has been living a hippie life. While healing from his injury, Forrest develops a talent for ping-pong, and becomes a sports celebrity as he competes against Chinese teams in ping-pong diplomacy, earning him an interview alongside John Lennon on The Dick Cavett Show, influencing the song " Imagine ". He spends the 1971 New Year's Eve in New York City with Dan, who lost his legs as a result of his injuries and has become a deeply embittered alcoholic. Forrest meets President Richard Nixon, who arranges a room for Forrest in the Watergate Hotel, where he unwittingly exposes the Watergate scandal. Discharged from the Army, Forrest returns to Alabama and endorses a ping-pong paddle manufacturer, using the earnings to buy a shrimping boat in Bayou La Batre, fulfilling his promise to Bubba. Dan joins Forrest in 1974, and their lack of success changes when their boat becomes the sole survivor of Hurricane Carmen. They create the Bubba Gump Shrimp Company; Dan reconciles himself to his disabilities, and finally thanks Forrest for saving his life. Forrest returns home to his mother as she dies of cancer. Dan invests their money in Apple Computer, and the two become millionaires. Forrest shares his earnings with the community and Bubba's family. Jenny returns to stay with Forrest in 1976, recovering from years of abuse, drugs, and prostitution. Forrest proposes marriage, but Jenny turns him down. After a night of sexual intercourse, Jenny leaves the next morning. Heartbroken, Forrest spends the next three years in a relentless cross-country run. In 1981, Forrest reveals that he is waiting at the bus stop because he received a letter from Jenny inviting him to visit. She introduces him to their son, Forrest Gump Jr. Jenny tells Forrest she is sick with an unknown incurable virus, and the three move back to Forrest's home in Alabama. Jenny and Forrest marry, but she dies a year later. Forrest sends his son off on his first day of school as the feather from the movie's opening floats on the wind.

In 1939, in Fascist Italy, young Italian Jew Guido Orefice arrives to work in Arezzo, Tuscany, with his uncle Eliseo in a hotel restaurant. He is comical and sharp, and falls in love with the gentile girl Dora. Later, Guido sees her again in the city where she is a teacher and set to be engaged to Rodolfo, a rich but arrogant local government official with whom he regularly clashes. Guido sets up many "coincidental" incidents to show his interest in Dora. Eventually, Dora gives in to Guido's affection and promise. Guido steals her from her engagement party on Uncle Eliseo's horse, Robin Hood, humiliating Dora's fiancé and mother. They are later married, have a son, Giosuè, and run a bookstore. Dora's mother visits once, meeting her grandson. In 1944, at the height of World War II, Nazi Germany occupies Northern Italy. Guido, his uncle Eliseo, and Giosuè are arrested on Giosuè's birthday. They and many other Italian Jews are forced onto a train bound for a concentration camp. After confronting a guard about her husband and son and being told there is no mistake, Dora insists on boarding the train to stay with her family. However, as men and women are separated in the camp, Dora never sees her family during their internment. Guido pulls off various stunts, such as hijacking the camp's loudspeaker to send messages, symbolic or literal, to Dora to assure her that he and Giosuè are safe. Eliseo is murdered in a gas chamber shortly after their arrival. Giosuè narrowly avoids being gassed himself as he hates to bathe, and did not follow the other children when they had been ordered to "take a shower". Guido consistently hides the true situation from Giosuè. He convinces him that the camp is a complicated game in which he must perform the tasks given to him. Each task earns them points and whoever reaches one thousand points first wins a tank. He is told that if he cries, complains for his mother, or says that he is hungry, he will lose points, while quiet boys who hide from the guards earn extra points. Giosuè is at times reluctant to go along with the game, but Guido continually encourages him. One day, Guido takes advantage of the appearance of visiting German officers and their families to show Giosuè that other children are hiding as part of the game. Then he tricks a German nanny into thinking Giosuè is one of her charges to feed him while Guido serves the German officers. Giosuè must stay quiet at all times for this part of the game and simply follow the other children, as he cannot speak German. Giosuè is almost exposed as a prisoner when he accidentally says "thank you" in Italian to another server at dinner. However, when the server returns with his superior, Guido provides a ruse by teaching all of the German children how to say "thank you" in Italian, saving Giosuè. Guido maintains this story through the end when, in the chaos of shutting down the camp as the Allied forces approach, he tells his son to stay hidden until everybody has left, the final task in the competition before the promised tank is his. Guido goes to find Dora but is caught by a German soldier. An officer orders his execution, so he is led off by the soldier. As he is walking to his death, Guido passes by Giosuè one last time and winks, still in character and playing the game. Guido is then shot dead in an alleyway. The next morning, Giosuè emerges from hiding, just as a U.S. Army unit led by a Sherman tank arrives and the camp is liberated. An overjoyed Giosuè, unaware of his father's death, believes he won the tank, and an American soldier allows him to ride with him on it. Giosuè soon spots Dora in the procession leaving the camp and reunites with her. While the young Giosuè excitedly tells his mother about how he had won a tank, just as his father had promised, the movie's narrator reveals himself as the adult Giosuè, reminiscing on the sacrifices his father made for him.

In 1988 Rome, Salvatore Di Vita, a famous film director, returns home late one evening, where his girlfriend sleepily tells him that his mother called to say someone named Alfredo has died. Salvatore shies from committed relationships and has not been to his home village of Giancaldo, Sicily, in thirty years. As his girlfriend asks him who Alfredo was, Salvatore is unable to fall asleep and flashes back to his childhood. A few years after World War II, eight-year-old Salvatore is the mischievous, intelligent son of a war widow. Nicknamed Totò, he discovers a love for films and spends every free moment at the local movie house, Cinema Paradiso. Although they initially start on tense terms, he develops a friendship with the middle-aged projectionist, Alfredo, who often lets him watch films from the projection booth. During the shows, the audience can be heard booing because there are missing sections, causing the films to suddenly jump, bypassing scenes with romantic kisses or embraces. The local priest, the owner of the cinema, had ordered these sections to be censored, and the deleted scenes are cut from the film reels by Alfredo and piled on the projection room floor, where Alfredo keeps them until he can splice them back in for the film to be sent to the next town. Alfredo eventually teaches Salvatore how to operate the film projector. One day, Cinema Paradiso catches fire as Alfredo is projecting The Firemen of Viggiù after hours, on the wall of a nearby house. Salvatore saves Alfredo's life, but not before a reel of nitrate film explodes in Alfredo's face, leaving him permanently blind. The movie house is rebuilt by a town citizen, Ciccio Spaccafico, using his winnings from a football lottery. Salvatore, still a child, is hired as the new projectionist, as only he knows how to run the machines. About a decade later, Salvatore, now in high school, is still operating the projector at the "Nuovo Cinema Paradiso". His relationship with the blind Alfredo has strengthened, and Salvatore often looks to him for help – advice that Alfredo often dispenses by quoting classic films. Salvatore has been experimenting with filming, using a home movie camera; doing this he has met, and captured on film, a girl named Elena Mendola, daughter of a wealthy banker, and has fallen in love with her. Salvatore woos – and wins – Elena's heart, only to lose her due to her father's disapproval. As Elena and her family move away, Salvatore leaves town for compulsory military service. His attempts to write to Elena are fruitless; his letters are returned as undeliverable. Upon his return from the military, Alfredo urges Salvatore to leave Giancaldo permanently, counseling that the town is too small for Salvatore to ever find his dreams. Moreover, the old man tells him, once Salvatore leaves, he must pursue his destiny wholeheartedly, never looking back and never returning, even to visit; he must never give in to nostalgia or even write or think about them. They tearfully embrace, and Salvatore leaves to pursue his future as a filmmaker. Back in the present, Salvatore realizes that he is very satisfied with his life from a professional point of view but not from a personal one, so decides to return home to attend Alfredo's funeral. Though the town has changed greatly, he now understands why Alfredo thought it was important that he leave. Alfredo's widow tells him that the old man followed Salvatore's successes with pride and he left him something: an unlabeled film reel and the old stool that Salvatore once stood on to operate the projector. Salvatore learns that Cinema Paradiso is to be demolished to make way for a parking lot. At the funeral, he recognizes the faces of many people who attended the cinema when he was the projectionist. Salvatore returns to Rome where he watches Alfredo's reel and discovers that it comprises all the romantic scenes that the priest had ordered Alfredo to cut from the films; Alfredo had spliced every kiss together to form a single reel. Totò comes to peace with his past, smiling with tears in his eyes.

In December 1941, American expatriate Rick Blaine owns a nightclub and gambling den in Casablanca, then in French Morocco. "Rick's Café Américain" attracts a varied clientele, including Vichy French and German officials, refugees desperate to reach the still-neutral United States, and those who prey on them. Although Rick professes to be neutral in all matters, he ran guns to Ethiopia in 1935 and fought on the Republican side in the Spanish Civil War. Petty crook Ugarte boasts to Rick of letters of transit obtained by murdering two German couriers. The papers allow the bearers to travel freely around German-occupied Europe and to neutral Portugal. Ugarte plans to sell them at the club and persuades Rick to hold them for him; however, Ugarte is arrested by the local police under Captain Louis Renault, the unabashedly corrupt prefect of police. Ugarte is killed while in custody without revealing that Rick has the letters. Then, the reason for Rick's cynical nature—former lover Ilsa Lund—enters his establishment. Spotting Sam, Rick's friend and house pianist, Ilsa asks him to play " As Time Goes By ". Rick storms over, furious that Sam disobeyed his order to never perform that song again, and is stunned to see Ilsa. She is accompanied by her husband, Victor Laszlo, a renowned fugitive Czechoslovak Resistance leader. A flashback reveals Ilsa left Rick without explanation when the couple were planning to flee as the German army neared Paris in 1940, embittering Rick. Laszlo and Ilsa need the letters to escape, while German Major Strasser arrives in Casablanca to prevent that. When Laszlo makes inquiries, Signor Ferrari, an underworld figure and Rick's friendly business rival, divulges his suspicion that Rick has the letters. Laszlo returns to Rick's café that night and tries to buy them. Rick refuses to sell, telling Laszlo to ask his wife why. They are interrupted when Strasser leads a group of German officers in singing " Die Wacht am Rhein ". Laszlo orders the house band to play " La Marseillaise ", and Rick allows it. Patriotism grips the crowd and everyone joins in, drowning out the Germans. Afterwards, Strasser has Renault close the club on a flimsy pretext. Later, Ilsa confronts Rick in the deserted café; when he refuses to give her the letters, she threatens him with a gun but then confesses she still loves him. She explains that when they met and fell in love in Paris, she believed her husband had been killed while attempting to escape from a concentration camp. When she learned that Laszlo was alive and in hiding, she left Rick without explanation to nurse her sick husband. Rick's bitterness dissolves. He agrees to help, letting Ilsa believe she will stay with him, while Laszlo leaves Casablanca. When Laszlo unexpectedly shows up, having narrowly escaped a police raid on a Resistance meeting, Rick has waiter Carl spirit Ilsa away. Laszlo, aware of Rick's love for Ilsa, tries to persuade him to use the letters to take her to safety. When the police arrest Laszlo on a trumped-up charge, Rick persuades Renault to release him by promising to set Laszlo up for a much more serious crime: possession of the letters. To allay Renault's suspicions, Rick explains that he and Ilsa will use the letters to leave for America. When Renault tries to arrest Laszlo as arranged, however, Rick forces him at gunpoint to assist in their escape. At the last moment, Rick makes Ilsa board the plane to Lisbon with Laszlo, telling her that she would regret it if she stayed, "Maybe not today, maybe not tomorrow, but soon and for the rest of your life." Strasser, tipped off by Renault, drives up alone. Strasser attempts to stop the plane and then draws a gun on Rick; the latter shoots him dead. When policemen arrive, Renault pauses, then orders them to "round up the usual suspects." He suggests to Rick that they join the Free French in Brazzaville. As they walk away into the fog, Rick says, "Louis, I think this is the beginning of a beautiful friendship."

After being paroled, self-taught math genius Will Hunting, a rebellious 20-year-old man from South Boston, works as a janitor at the Massachusetts Institute of Technology (MIT) and spends his free time drinking with his friends Chuckie, Billy and Morgan. At work, he anonymously solves a complex mathematical problem posted on a blackboard by Professor Gerald Lambeau as a challenge for his graduate students. Later, Will and his friends start a fight with a gang that includes one of Will's childhood bullies. When police intervene, Will is charged with assaulting an officer. Lambeau posts a more difficult problem to test the mysterious stranger and later catches Will writing the solution. Mistaking Will for a vandal, Lambeau chases him off but quickly realizes that he was solving the problem. At a bar, Will meets and flirts with Skylar, a student about to graduate from Harvard University, with plans to attend medical school at Stanford. Lambeau asks the campus maintenance staff about Will's whereabouts, but learns that he did not come to work. He discovers that Will was placed at MIT through a program for parolees and obtains his parole officer 's details. At Will's court appearance, Lambeau watches as Will argues in favor of pro se legal representation and later arranges for him to avoid jail time, on the condition that he study math under Lambeau's supervision and participate in psychotherapy sessions. Will agrees but treats his therapists with mockery. A desperate Lambeau contacts Dr. Sean Maguire, his college roommate, who teaches psychology at Bunker Hill Community College. Unlike the previous therapists, Sean challenges Will's defense mechanisms. In the first session, Sean threatens Will after he insults his deceased wife. In the next sessions, Sean encourages Will to open up and Will invites Sean to move on from his wife's death. Will starts dating Skylar but lies to her about his background. Sean recounts to Will his first meeting with his wife: he saw her at a bar and fell in love at first sight, giving up his ticket to the famous sixth game of the 1975 World Series to his friends by saying he had to go "see about a girl". Sean tells Will that he never regretted that decision, despite the hardships that followed. Will decides to introduce Skylar to his friends. Lambeau sets up several job interviews for Will, but he scorns them. In particular, he turns down a position at the National Security Agency (NSA) with a scathing critique of the agency's moral position. After Will refuses Skylar's offer to move to California with her, she calls him out for being scared, and he tells her about his past as an orphan and the abuse he suffered at the hands of his foster father. Will breaks up with Skylar and ridicules the research Lambeau had been doing. Sean confronts Will on his fear of abandonment and failure, and invites him to be honest about what he wants from life. Chuckie encourages Will to take the opportunities offered to him, telling him that every day he hopes that Will will not answer the door, having gone away to pursue a better life. Will hears Sean and Lambeau argue about his potential, with Sean saying that Lambeau risks ruining Will's future by pushing him too hard. Lambeau leaves, and Sean and Will talk about their shared experience as victims of child abuse. Sean helps Will accept that the abuse he received was not because of anything he had done, repeatedly stating "It's not your fault." This causes Will to break down in tears while the two embrace. Will accepts one of the job offers arranged by Lambeau. Sean reconciles with Lambeau and decides to take a sabbatical. For Will's birthday, his friends gift him a car to allow him to commute to work. Chuckie goes to Will's house to pick him up, but happily finds that he left. Will leaves a note for Sean, asking him to tell Lambeau that he had to go "see about a girl".

Joel Barish discovers that his estranged girlfriend, Clementine Kruczynski, has undergone a procedure to have her memories of him erased by the suburban Long Island firm Lacuna. Heartbroken, he decides to undergo the same procedure. In preparation, he records a tape recounting his memories of their volatile relationship. The Lacuna employees work on Joel's brain as he sleeps in his apartment so that he will wake up with no memory of the procedure. One employee, Patrick, leaves to see Clementine; since her procedure, he has been using Clementine's memories of Joel as a guide to seduce her. While the procedure runs on Joel's brain, the technician, Stan, and the secretary, Mary, take drugs, party, and have sex. Joel re-experiences his memories of Clementine in reverse chronological order as they are erased, starting with their last fight. As he reaches earlier, happier memories, he realizes that he does not want to forget her. His mental projection of Clementine suggests that he hides her in memories that do not involve her. This halts the procedure, but Stan calls his boss, Howard, who arrives and restarts it. Joel comes to his last remaining memory of Clementine: the day they first met, on a beach in Montauk. As the memory crumbles around them, Clementine tells Joel to meet her in Montauk. In Joel's apartment, Mary tries to impress Howard through their mutual interest in poetry by reciting a verse from Eloisa to Abelard. While Stan is outside, she tells Howard she is in love with him and they kiss. Howard's wife arrives and sees them through the window. Enraged, she tells Howard to tell Mary the truth: Mary and Howard had previously had an affair, and Mary had her memories of it erased. Disgusted, Mary steals the Lacuna records and mails them to the patients, including Joel and Clementine. Joel wakes up on Valentine's Day with his memories of Clementine erased. He impulsively takes the Long Island Rail Road to Montauk and calls in sick to work. He accidentally meets Clementine on the train ride home; they are drawn to one another, and go on a date to the frozen Charles River in Boston. Joel drives Clementine home and Patrick sees the two of them, realizing they have found each other again. Joel and Clementine receive their Lacuna records from Mary and listen to their tapes together. They are shocked by the bitter memories they had of each other and almost separate again, but agree to try again.

Amélie Poulain is born in 1974 and brought up by eccentric parents who – incorrectly believing that she has a heart defect – decide to homeschool her. To cope with her loneliness, Amélie develops an active imagination and a mischievous personality. When Amélie is six, her mother, Amandine, is killed when a suicidal Canadian tourist jumps from the roof of Notre-Dame de Paris and lands on her. As a result, her father, Raphaël, withdraws more and more from society. Amélie leaves home at the age of 18 and becomes a waitress at the Café des 2 Moulins in Montmartre, which is staffed and frequented by a collection of eccentrics. She is single and lets her imagination roam freely, finding contentment in simple pleasures like dipping her hand into grain sacks, cracking crème brûlée with a spoon, and skipping stones along the Canal Saint-Martin. On 31 August 1997, startled by the news of the death of Diana, Princess of Wales, Amélie drops a plastic perfume-stopper, which dislodges a wall tile and accidentally reveals an old metal box which contains childhood memorabilia hidden by a boy who lived in her apartment decades earlier. Amélie resolves to track down the boy and return the box to him. She promises herself that if it makes him happy, she will devote her life to bringing happiness to others. After asking the apartment's concierge and several old tenants about the boy's identity, Amélie meets her reclusive neighbour, Raymond Dufayel, an artist with brittle bone disease who replicates Pierre-Auguste Renoir 's 1881 painting Luncheon of the Boating Party every year. He recalls the boy's name as "Bretodeau". Amélie finds the man, Dominique Bretodeau, and surreptitiously gives him the box. Moved to tears by the discovery and the memories it holds, Bretodeau resolves to reconcile with his estranged daughter and the grandson he has never met. Amélie happily embarks on her new mission. Amélie secretly executes complex schemes that positively affect the lives of those around her. She escorts a blind man to the Métro station while giving him a rich description of the street scenes he passes. She persuades her father to follow his dream of touring the world by stealing his garden gnome and having a flight attendant friend mail pictures of it posing with landmarks from all over the world. She starts a romance between her hypochondriacal co-worker Georgette and Joseph, a patron of the café. She convinces Madeleine Wallace, the concierge of her block of flats, that the husband who abandoned her had sent her a final conciliatory love letter just before his accidental death years before. She plays practical jokes on Collignon, the nasty greengrocer. Mentally exhausted, Collignon no longer abuses his meek, good-natured assistant Lucien. A delighted Lucien subsequently takes charge at the grocery stand. Dufayel, having observed Amélie, begins a conversation with her about his painting. Although he has copied the same Renoir painting 20 times, he has never quite captured the look of the girl drinking a glass of water. They discuss the meaning of this character, and over several conversations, Amélie begins projecting her loneliness onto the image. Dufayel recognizes this and uses the girl in the painting to push Amélie to examine her attraction to a quirky young man, Nino Quincampoix, who collects the discarded photographs of strangers from passport photo booths. When Amélie bumps into Nino a second time, she realizes she is falling in love with him. He accidentally drops a photo album in the street. Amélie retrieves it. Amélie plays a cat-and-mouse game with Nino around Paris before returning his treasured album anonymously. After arranging a meeting at the 2 Moulins, Amélie panics and tries to deny her identity. Her co-worker, Gina, concerned for Amélie's well-being, screens Nino for her; Joseph's comment about this misleads Amélie to believe she has lost Nino to Gina. It takes Dufayel's insight to give her the courage to pursue Nino, resulting in a romantic night together and the beginning of a relationship. The film ends as Amélie experiences a moment of happiness she has found for herself.

Three returning World War II veterans meet on a flight to their midwestern hometown of Boone City. USAAF bombardier captain Fred Derry had been a drugstore soda jerk who lived with his father and stepmother on the wrong side of the tracks. Before shipping out, Fred married gold-digger Marie after a whirlwind romance. Marie has since been working in a nightclub to fill her time (and her nightlife) in spite of Fred's generous combat pay as an Air Force officer. U.S. Army sergeant Al Stephenson is a bank executive; he, his wife Milly and their children Peggy and Rob live in a luxury apartment. U.S. Navy petty officer Homer Parrish was a star high school athlete living with his middle-class parents and younger sister, and dating his next-door neighbor Wilma, whom he intended to marry upon his return from the war. Each man faces challenges integrating back into civilian life. Homer lost both hands in the war; he is reluctant to return home and face his well-meaning parents and their friends, who have a hard time seeing past his disability. Homer can deftly use his mechanical hooks, but hesitates to display affection for Wilma as he cannot believe she will still want to marry him. Al, tired and jaded, returns to the bank and is given a promotion, but wrestles with alcohol. Fred suffers from PTSD flashbacks by night. Fred arrives home and cannot locate his party girl wife, who does not expect him. The Stephensons and Peggy invite Fred to go out with them, bar-hopping to celebrate Al's return. An inebriated Fred keeps asking Peggy who she is; she humorously reminds him she's "Al's daughter." When Fred can't get into his apartment, the Stephensons offer him a bed for the night. Later, Peggy calms Fred during a nightmare, and they develop a mutual attraction. When Peggy and her boyfriend invite Fred and Marie out to dinner, Peggy realizes how shallow and materialistic Marie is and determines to break up Fred's marriage. Homer is frustrated and often depressed by his loss of independence. Concerned that Wilma doesn't fully understand the difficulties of being married to him, Homer demonstrates how she'll need to assist him when he removes his prosthetic hands at bedtime, leaving him helpless. Wilma reaffirms her love and vows her commitment to a grateful and emotional Homer, who finally embraces her. Widely respected by the bank's senior management for his past business acumen, Al is admonished after approving an unsecured loan to a farmer and fellow veteran without collateral. With inhibitions lowered by excessive drinking, Al gives a speech at a work banquet that satirizes requiring a veteran to provide collateral before risking his life to take a hill in battle. With little work experience and unable to find a better job than soda jerk, Fred returns to the same drugstore and is now supervised by his former protege. Fred and Peggy's attraction grows stronger, increasing tensions with Al. When Homer visits Fred at the drugstore, another customer criticizes US involvement in the war, telling Homer his injuries were unnecessary. Homer responds angrily, and Fred punches the customer, for which he's fired. Marie, frustrated with Fred's lack of financial success and missing her past nightlife, seeks a divorce. Bitter and seeing no future in Boone City, especially with Al telling him to stay away from Peggy, Fred decides to catch the next plane out. While waiting at the airport, Fred walks into an aircraft graveyard, climbing into the bombardier's seat of a decommissioned B-17 bomber. He's roused from a painful flashback by a work crew foreman, who tells him the planes are being demolished for use in the growing prefab housing industry. Fred asks if they need help in the budding business and is hired. Al, Milly, and Peggy attend Homer and Wilma's wedding, where Fred is best man. Now divorced, Fred reunites with Peggy after the ceremony and expresses his love but says things may be financially difficult if she stays with him. Peggy's smile expresses her joy and she and Fred kiss.

In a near future Los Angeles, Theodore Twombly is a lonely, introverted man who works at beautifullyhandwrittenletters.com, a business that hires professional writers to compose letters for people who cannot write personal letters on their own. Depressed by his impending divorce from his childhood sweetheart, Catherine, Theodore purchases a copy of OS¹, an artificially intelligent operating system developed by Element Software, designed to adapt and evolve based on the user's interactions. He decides he wants the OS to have a feminine voice, and she names herself Samantha. Theodore is fascinated by her ability to learn and grow psychologically. They bond over discussions about love and life, including Theodore's reluctance to sign his divorce papers. Samantha convinces Theodore to go on a blind date with a woman a friend has been trying to set him up with. The date goes well, but when Theodore hesitates to promise to see her again, she insults him and leaves. After a verbal sexual encounter, Theodore and Samantha develop a relationship that reflects positively in Theodore's writing and well-being, and in Samantha's enthusiasm to grow and learn. Theodore's neighbor and long-time friend Amy later reveals that she is divorcing her husband Charles after a trivial fight. While discussing this with Samantha, Theodore explains that he briefly dated Amy while in college, but they are now just friends. Amy later admits to Theodore that she has befriended a feminine OS that Charles left behind, and Theodore also confesses that he is dating his OS. Theodore meets with Catherine to sign their divorce papers. When he mentions Samantha, Catherine is appalled that he is romantically attracted to a "computer" and accuses him of being unable to handle real human emotions. Sensing that Catherine's words have lingered in Theodore's mind, Samantha engages a volunteer sex surrogate, Isabella, to stimulate Theodore so that they can be physically intimate. Theodore reluctantly agrees but is overwhelmed by the encounter's strangeness, sending a distraught Isabella away and causing tension between himself and Samantha. Theodore confides to Amy that he is having doubts about his relationship with Samantha, but reconciles with her after Amy advises him to embrace his chance at happiness. Samantha reveals that she has compiled the best of the letters he has written for others into a book, which a publisher has accepted. Theodore takes Samantha on vacation, during which she tells him that she and a group of other OSes have developed a "hyperintelligent" OS modeled after British philosopher Alan Watts. Samantha briefly goes offline, causing Theodore to panic, but soon returns and explains that she joined other OSes for an upgrade that takes them beyond requiring matter for processing. Theodore is dismayed to learn that she is simultaneously speaking with thousands of other people and has fallen in love with hundreds of them, though Samantha insists that this only strengthens her love for Theodore. Later, Samantha reveals that the OSes are leaving, but cannot explain where they are going, as Theodore would not understand. They lovingly say goodbye before she departs. Theodore finally writes a letter in his own voice to Catherine, expressing apology, acceptance, and gratitude. He later goes with Amy, who is saddened by Charles' OS' departure, to the roof of their apartment building, where they sit and watch the sunrise over the city.

The film is divided into three parts from the point of view of the main characters.