It's Christmas Eve and Geronimo is getting ready for his enormous party, when one disaster after another happens to the poor mouse. First, he breaks his paw while trying to help a truck driver recover the candy that he spilled all over the street. Next, he helps an elderly mouse cross the street and gets his tail run over. When the ambulance shows up, Geronimo falls off the stretcher.

With his paw in a cast, a broken tail and a bruised snout, Geronimo is losing his holiday spirit. But then Benjamin calls him a hero! Awwww! Things are looking up. But wait a minute --- Geronimo's worst holiday problems are yet to come. Can his Christmas be saved?