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.

When the Switchblade, the most sophisticated prototype stealth fighter created yet, is stolen from the U.S. government, one of the United States' top spies, Alex Scott, is called to action. What he doesn't expect is to get teamed up with a cocky civilian, World Class Boxing Champion Kelly Robinson, on a dangerous top secret espionage mission. Their assignment: using equal parts skill and humor, catch Arnold Gundars, one of the world's most successful arms dealers.