Clark Griswold is on a quest to take his family to the Walley World theme park for a vacation, but things don't go exactly as planned.

Writer Nick Gardenia is kidnapped from his California cliffhouse and forced to rob a bank. Now a fugitive, he seeks help from his ex-wife who is now a public defender and has remarried — to a prosecutor.

New Yorkers Skip Donahue and Harry Monroe have no jobs and no prospects, so they decide to flee the city and find work elsewhere, landing jobs wearing woodpecker costumes to promote the opening of a bank. When their feathery costumes are stolen and used in a bank robbery, they no longer have to worry about employment — they're sent to prison.