The lovable Munster family finds their placid world turned into turmoil by the diabolical Dr. Diablo, the mastermind of an art heist using monster robots, including clones of Herman and Grandpa.

Computer genius and chess champion Ted Danson is lured into service by secret agent Eleanor Parker and becomes a reluctant hero thanks to a number of exploits with villainous Christopher Lee and his army of lethal blue-eyed blonde women.