World War II rears its ugly head in this patriotic (if somewhat nonsensical) Tarzan picture. When a Nazi pilot (Rex Williams) crash lands in the jungle, he is nursed back to health by Tarzan (Johnny Weissmuller) and Boy (Johnny Sheffield). The isolationist ape man is vaguely aware that the Nazi is part of an invading German force, but he refuses to become involved with the problems of the world. The Nazis march into a "lost" jungle kingdom, enslaving the citizens and threatening the life of their princess (Frances Gifford). Gradually Tarzan becomes convinced that the Nazis are up to no good, destroys their invasion plans, and restores the princess to her throne. Don't miss the Tarzan Triumphs scene in which Cheeta the chimpanzee is mistaken for Adolph Hitler!