Emperor Spengo sees Marge Nelson and using a giant magnet, kidnaps her and her husband Dick, hoping to make Marge his before blowing up the Earth. The Emperor and other inhabitants of his planet are somewhat less than bright, and Dick begins reliving episodes of Flash Gordon and Buck Rogers in order to rescue Marge, save the Earth, and restore the rightful emperor to the throne.

Salesman Roy Knable spends all his free time watching television, to the exasperation of his wife, Helen. One day, TV salesman Spike convinces Roy to buy a satellite dish offering 666 channels. The new addition to Roy's home entertainment system sucks him and Helen into Hellvision, a realm run by Spike, who is an emissary of Satan. For 24 hours, the couple must survive devilish parodies of TV programs if they want to return to reality alive.