As World War II rages, a formation of German paratroopers land in the hidden city of Palandria to exploit its wealth and they start taking hostages.

Johnny Weissmuller ... Tarzan
Johnny Sheffield ... Boy
Frances Gifford ... Zandra
Stanley Ridges ... Colonel von Reichart
Sig Ruman ... German Sergeant (as Sig Rumann)
Philip Van Zandt ... Captain Bausch
Rex Williams ... Lt. Reinhardt Schmidt
Pedro de Cordoba ... Patriarch
Louis Adlon ... German Officer in Berlin
Sven Hugo Borg ... Heinz
Stanley Brown ... Achmet
George Lynn ... Nazi Pilot
Manuel París ... Pallandria Man
Otto Reichow ... Grüber
Wilhelm von Brincken ... General Hoffman in Berlin
William Yetter Sr. ... Nazi Guard