The film begins in the laboratory of the eminent biochemist Mr. Stendahl (Otto Kruger). As his assistants, Ann Forester (Amelita Ward) and Don Young (Phil Brown) observe, he successfully concludes an experiment to restore life to a dead rabbit. Meanwhile at the city morgue, the misshapen Moloch (Rondo Hatton) arrives to claim the body of the now dead Ape Woman (Vicky Lane). The inquisitive attendant begins checking his credentials and is strangled for his efforts. Moloch escapes unseen with his quarry in a stolen ambulance.