A psychopath killer being transported to his execution by the state troopers manages to escape when the van collides with a cryogenetic truck, causing a major acid spill and transforming him into a... you'll not believe this... a mutant snowman, who wrecks havoc and revenge on the town where he committed his crimes.

Actually a very decent horror movie which deserves to be promoted, which is less than can be said about its really awful straight-to-video sequel Jack Frost II in 2000.