The "Satans" are a very cruel biker gang led by Anchor. The gang goes to a diner in the middle of nowhere in the California desert where they begin to terrorize Lew and his patrons and his waitress, Tracy. After a little killing, one of the patrons named Johnny manages to escape from the bikers into the desert. They need to reach a town before the Satans catch up to them and kill them.
While in Vietnam, a GI promises his dying buddy that he'll take care of his motorcycle, "Baby", when he gets back home. After his discharge, he meets up with his dead friend's girlfriend, gets the bike, and then runs into trouble from some other bikers who don't like the idea of his having the motorcycle or the girl.
The story of a young girl saved from desperation by an older farmer who makes her his wife. The old man cannot fulfill his young bride's desires or keep pace with her youth. What is a girl to do? Naturally, pursue the farmhand.
