Millions of years ago, the prehistoric ancestors of today's trucks, such as garbageadon, dozeratops, and craneosaurus, roamed the Earth until they rusted out and became extinct.

Stuck in a museum where they are poked, prodded, studied, and shaken by visitors, the Dinotrux, unearthed prehistoric ancestors of today's trucks, take revenge when Tyrannosaurus Trux discovers chewing gum all over his claws.