A young American Veteran gets involved with a gang of Venice Beach psychos who are killing people to extract a psychedelic compound from their victim's adrenal glands.
When a tribe of cavewomen imparts cruel justice on one of their own their fate takes a turn for the worst. After discovering and falling in love with the corpse sacrificed by the girl-gang, a lone wandering giant of pre-historic mythos is inspired to homicide. Consequently the cavewomen are menaced by the heartbroken and bloodthirsty cave-brute with a grudge, and the prophetess among them is ignored when she predicts the tragic outcome.