The action-adventure scenes of unconvincing sword fights, passable martial arts, and other macho displays alternate with the feminine displays of twins Mira and Mara (Leigh Harris and Lynette Harris) in this prehistoric fantasy. Mira and Mara were raised as boys -- for awhile, anyway -- to protect them from their villainous father Traigon (Robert Ballesteros) who needs to sacrifice his first-born to the gods in order to become even more powerful in the arts of magic. The twins are aided in their struggle against their father by two warriors, Erlik (Bob Nelson), dubbed with a Southern accent that gives away the tongue-in-cheek subtext of the plot, and Baldar (Bruno Rey). Subsidiary battles with sex-starved zombies who have been put away too long, and the monkey men who suffer from the same problem, imply that sexual deprivation can lead to some nasty-tempered machos, even if they are zombies.