Aegeon of Syracuse has come to Ephesus to seek his son, who went in search of his missing twin and mother months ago. Too bad that Ephesus has just declared war on Syracuse, and will instantly put to death any Syracusean found within their borders unless a ransome's paid. Meanwhile, the son, Antipholus, and his servant, Dromio (also an identical twin), keep running into strangers who seem to know them...
Meet Joel Goodson, an industrious, college-bound 17-year-old and a responsible, trustworthy son. However, when his parents go away and leave him home alone in the wealthy Chicago suburbs with the Porsche at his disposal he quickly decides he has been good for too long and it is time to enjoy himself.
High School student David Lightman (Matthew Broderick) has a talent for hacking. But while trying to hack into a computer system to play unreleased video games, he unwittingly taps into the Defense Department's war computer and initiates a confrontation of global proportions! Together with his girlfriend (Ally Sheedy) and a wizardly computer genius (John Wood), David must race against time to outwit his opponent.
The Griswold family are on a quest. A quest to a Walley World theme park for a family vacation, but things aren't going to go exactly as planned, especially when Clark Griswold is losing all thought towards a mysterious blonde in a red Ferrari.