A joint U.S.-Swiss production in the waning days of the 35-year-old Tarzan series, this film stars Mike Henry in the second of his three film appearances as the jungle king. The film is set in South America, where one of Tarzan's friends is murdered at Tarzan's favorite zoo. The culprits are the Leopard Men, a group of tribal humans dressed and behaving like jungle animals. They are headed by Chief Barcuna (Rafer Johnson). Tarzan recruits Captain Sam Bishop (Jan Murray) and some animal friends to help defeat Barcuna, who is planning on leading a revolt of his Leopard Men against peaceful tribal leaders. ~ Michael Betzold