A wealthy executive, Drew Latham (Ben Affleck) has no close relationships and becomes nostalgic for his childhood home as Christmas approaches. When he visits the house and finds another family living there, he offers the residents, Tom Valco (James Gandolfini) and his wife, Christine (Catherine O'Hara), a large sum of money to pretend they are his parents. Soon Drew tests the couple's patience, and, when their daughter, Alicia (Christina Applegate), arrives, things get increasingly tense.

The Angels are charged with finding a pair of missing rings that are encoded with the personal information of members of the Witness Protection Program. As informants are killed, the ladies target a rogue agent who might be responsible.

A quirky teen with a penchant for war reenactments, Kelly Ernswiler obsesses over military tactics with his buddy Bart. The school bully is one of Kelly's regular headaches, and he also has to deal with a frustrating situation at home, where his father is a recovering drug addict. Kelly's life gets even more complicated when he falls for Tabby, Bart's pretty and soon-to-be-wed older sister.

With high school a distant memory, Jim and Michelle are getting married — and in a hurry, since Jim's grandmother is sick and wants to see him walk down the aisle — prompting Stifler to throw the ultimate bachelor party. And Jim's dad is reliable as ever, doling out advice no one wants to hear.

Rich, successful Bryce meets beautiful Lissa at a bar one night and invites her back to his house, not suspecting for a moment that Lissa isn't really who she seems. What unfolds next is a dangerous, tangled web of double-crosses and seduction.