When Santa Claus decides to retire and pass on his magic bag of Christmas surprises to a new Saint Nick, he enlists the aid of a hilarious assortment of characters. A perky teen runaway and hapless taxi driver Ernest P. Worrell must convince a skeptical kiddie-show host to take over the post of Father Christmas.

Bumbling bank janitor Ernest P. Worrell is assigned to jury duty, and soon finds himself in trouble when he is covertly switched with a look-a-like crime boss. Ernest must escape from jail to expose the mix-up.