Barney Chavez (Raymond Burr) is a plantation manager in the South American jungles. He murders his employer to get his wife, Dina Van Gelder (Barbara Payton). However; an old witch-doctor Al-Long (Gisela Werbisek) bears witness to the murder and places a curse on Barney. By night Barney metamorphosises into a giant rampaging gorilla. Taro (Lon Chaney Jr.) must solve the murder of the plantation owner along with a wave of mysterious animal killings. Taro then suspects that not is all that it seems…
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