PLOT

Thirteen years after their high school graduation, Jim Levenstein lives in the Chicago area with his wife Michelle and their two-year-old son, Chris "Oz" Ostreicher works as a sportscaster in Los Angeles with his unfaithful supermodel girlfriend Mia and unhappy, Kevin is married and works from home as an architect, Finch tells his friends that he has been traveling the world, and Steven Stifler works as an office temp for a verbally abusive boss.

Former classmate John, one half of the "MILF" duo, organizes a Class of 1999 high school reunion in East Great Falls, Michigan. Jim and Michelle return to Jim's childhood home, where he encounters his neighbor Kara, whom he used to babysit, and will soon turn 18. Jim meets Oz, Kevin, and Finch at a bar, where they meet Selena, Michelle's friend from band. Stifler appears unexpectedly. The next day, at the beach, Oz meets his high school girlfriend, Heather, who is dating a cardiologist named Ron and Kevin reconnects with high school sweetheart Vicky. Stifler destroys Kara's boyfriend's jet-ski much to the disapproval of the guys. That night, they stumble upon Kara's birthday party. Kara gets drunk; Jim drives her home, and she tries to seduce him. Kevin wakes up next to Vicky and assumes they had drunken sex.

Jim and Michelle attend a party hosted by Stifler and bring Jim's widower dad along; whom Stifler gets drunk. Kevin confronts Vicky who maintains they did not have sex. Mia takes ecstasy, and Ron humiliates Oz. Heather comforts Oz, and they reconcile before Mia and Heather get into a fight. Jim's dad meets Stifler's mom. Michelle, concerned about the recent lack of sex in their marriage, attempts to have BDSM sex with Jim but is interrupted by Kara. Her boyfriend arrives and a fight breaks out between his friends and Jim's friends. Jim tells Michelle he does not care about Kara. Upset, both Kara and Michelle leave. The police arrest Finch for stealing a motorcycle. Stifler is amused by Finch's arrest. Exasperated by his immaturity, the guys rally to Finch's side and admit that they dislike Stifler. Distraught, Stifler ends the party. The next morning, Jim's dad offers advice on how to fix the marriage.

At the reunion, Finch admits to being an assistant manager at Staples. The boys apologize to Stifler, and insist that high school would not have been fun without him. Stifler quits his job and the guys head to the reunion together. Kevin reconciles with Vicky. Finch makes amends for lying to Selena. Oz reunites with Heather after breaking up with Mia and Stifler punches Ron for threatening Oz. Jim reconciles with Michelle and Nadia interrupts them having sex but is pleased to see the couple is still together. Jessica reveals that she is a lesbian, and with Stifler's help, Sherman hooks up with Loni. Stifler is offered a job planning a wedding. Finch's mom makes a brazen sexual pass at Stifler and they proceed to have sex on the lacrosse field. John is reunited with his estranged buddy, Justin, and they watch Stifler having sex while shouting “MILF!” from the bleachers.

The next morning, Jim and Kara apologize to each other. Oz plans to stay in town with Heather, Finch plans a trip with Selena to Europe, and Stifler drops subtle hints about sleeping with Finch's mom. Kevin proposes a pact for them to reunite once a year.

In a mid-credits scene, Jim's dad gets fellatio from Stifler's mom in a movie theater.

CAST

Jason Biggs as Jim

Alyson Hannigan as Michelle

Chris Klein as Oz

Thomas Ian Nicholas as Kevin

Seann William Scott as Stifler

Tara Reid as Vicky

Mena Suvari as Heather

Eddie Kaye Thomas as Finch

John Cho as MILF Guy #2

Jennifer Coolidge as Stifler's Mom

Eugene Levy as Jim's Dad

Natasha Lyonne as Jessica

Dania Ramirez as Selena

Katrina Bowden as Mia

Jay Harrington as Dr. Ron

Ali Cobrin as Kara

Chuck Hittinger as AJ

Shannon Elizabeth as Nadia

Chris Owen as Sherman

Justin Isfeld as MILF Guy #1

Charlene Amoia as Ellie

Vik Sahay as Prateek Duraiswamy

Molly Cheek as Jim's Mom

Rebecca De Mornay (uncredited) as Rachel Finch

ADDITIONAL INFORMATION

also known as American Reunion or American Pie: Reunion in certain countries

the fourth installment in the American Pie series