Two slackers, mechanic Coop and his best friend Jamie, find a mecha robot from the future called Megas (Mechanized Earth Guard Attack System) in a New Jersey junkyard. Coop modifies Megas and replaces his head, the control center, with a classic muscle car, and names him XLR (eXtra Large Robot). Together with Megas's original pilot Kiva (Wendee Lee), they must defend Earth from the evil alien race called "the Glorft".