Pursued by intergalactic warlord Krulos and his Rulons, human Valorians fly through a wormhole and end up on the prehistoric Earth. Krulos follows and becomes stuck in prehistory as well. Both sides build dinosaur armies and engage.
When three alien motorcycle riding mice are forced to leave their home planet of Mars thanks to the evil mining Plutarkians, they rebel against their enemies on planet Earth and the city of Chicago.