Deep in the South American jungles, plantation manager Barney Chavez (Raymond Burr) kills his elderly employer in order to get to his beautiful wife Dina Van Gleder (Payton). However, an old native witch witnesses the crime and puts a curse on Barney, who soon after finds himself turning nightly into a rampaging gorilla. When a wise but superstitious police commissioner Taro (Lon Chaney) is brought in to investigate the plantation owner’s death and a rash of strange animal killings, he begins to suspect that all is not as it seems.
