When Jim Wheatley (Charles Gray) mysteriously disappears while exploring a cave near a Mexican village, his sister Gina (Mala Powers) and her husband Dan Matthews (John Howard) travel to the area to search for him. They are joined by embittered, crippled Pete Morgan (Paul Richards), who holds Dan responsible for his injury—sustained while saving Dan's life. To complicate matters further, Gina was Pete's sweetheart before the accident. Local legends tell of the "Cave of the Dead," where human sacrifices were once made to the gods. Dr. Ramsey (Gerald Milton), who is married to a native woman, Concha (May Wynn), claims ignorance of the cave but is in the region to study rapid fungus growth in the climate—a crucial part of his research on antibiotics. As Dan and Pete pursue the mystery, they slowly unravel the terrifying secret hidden within the cave. Cast: - John Howard - Mala Powers Runtime: 76 minutes.