The film stars Robert Hutton and Mary Castle as a married couple, held hostage in a dismal, deserted town by three escaped convicts. The crooks are looking for a cache of stolen loot, and they intend to keep Hutton and Castle alive long enough to locate and dig up the cash for them.

At first gas station attendant Poet is happy when the rockers gang “Hell’s Angels” finally accepts him. But he’s shocked when he learns how brutal they are – not even murder is a taboo to them. He gets himself in trouble when the leader’s girlfriend falls in love with him – and he welcomes her approaches.

A doctor finds a jungle laboratory, complete with mad scientist and genetic engineering experiments

Biker gang leader Kisum (Adam Roarke) loves waitress Marcia Little Hawk (Joanna Frank). Her brother Johnnie Little Hawk (Robert Walker, Jr.), the leader of a group of American Indians disapproves. At various times these two groups are adversaries and allies. The two groups join forces but crooked businessmen scheme to have them at each other's throats again. The theme song "Anyone for Tennis" is by Cream. The Iron Butterfly are heard playing their classic "Iron Butterfly Theme." Producer Dick Clark and director Richard Rush made "Psych-Out" earlier in the year.