After a young man is killed in an unexplored subterranean cavern and his girlfriend driven mad by something she saw there, a track found at the scene cannot be identified with any known animal and thus a scientific expedition is launched to find out just what it is that is living there.

Bruno Halder a sinister scientist seeking revenge against his brother and niece is resurrected by Waldo his faithful sidekick. Besides his minions of zombies Halder enlists the help of Wolfman, Franquestain, a Vampire, a Mummy and a Cyclops. Once again the survival of mankind is put in the hands of Santo

A singing cowboy falls foul of alien invaders and beautiful women from Venus.