A religious brother and sister endure alone together in the post-apocalyptic Outback, until the sudden arrival of a stranger who helps them build a crude plane to fly out of the desert.

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.