Happy go-lucky teen Billy Duncan discovers an otherworldly laser gun in the southern California desert, making him the target of a pair of aliens who had recently executed its previous owner.
Angel City trooper Jack Deth is sent back in time from 2247 to 1985 L.A. to inhabit the body of his ancestor. Deth's assignment is to find his archenemy, Whistler, who turns people into zombies, before the fiend is able to kill all the ancestors of the future's governing council.