Plot: Frank and Roger and their wives take off for Colorado in a recreational vehicle, looking forward to some skiing and dirt biking. While camping en route, they witness a Satanic ritual sacrifice, but the local sheriff finds no evidence to support their claims and urges them to continue on their vacation. On the way, however, they find themselves repeatedly attacked by cult members, and they take measures to defend themselves.
Alternative Plot: Roger (Peter Fonda), his friend Frank (Warren Oates), and their wives (Lara Parker, Loretta Swit) are heading from San Antonio to the wilderness of rural Texas for some off-road motocross. What they find instead is a Satanic cult sacrifice, and they are unfortunate enough to be caught observing the ritual. Naturally, this doesn't sit too well with the cult members. Now Roger and Frank are on the run from what is apparently a very sizable Texan Satanist community.
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