Tarzan Triumphs is a 1943 adventure film in which Tarzan fights the Nazis. Johnny Weissmuller had portrayed the Edgar Rice Burroughs character in six films with Metro-Goldwyn-Mayer, but this was his first with the producer Sol Lesser at RKO Pictures. Lesser had previously produced Tarzan the Fearless and Tarzan's Revenge. Weissmuller was reunited with two of his three co-stars from several of the earlier films, Johnny Sheffield and Cheeta, but Maureen O'Sullivan was unable to reprise her role as Jane because the franchise switched from MGM to RKO, and O'Sullivan was an MGM contract player. Instead, Frances Gifford played the princess of the lost city of Palandrya, which is conquered by Germans. Plot During World War II, Tarzan and his son, Boy, are living on the Great Escarpment, though Jane has returned to the United Kingdom to tend to her sick mother. Jane's letter to Tarzan and Boy describes the ongoing struggle against Nazi Germany. Searching for raw materials in Sub-Saharan Africa to help Germany's cause, a small force of Nazi paratroopers lands and takes over the lost city of "Palandrya" as an advance base and enslave its people. Lieutenant Schmidt is separated from the other paratroopers, but has a short wave radio enabling him to contact his superiors in Berlin. Schmidt convalesces at Tarzan's camp, telling Tarzan he is English. Zandra escapes after the Nazis kill her brother Achmet. Finding Tarzan, she discloses the Nazis' presence, and he concludes Schmidt is a Nazi. Tarzan's chimpanzee, Cheetah, with an elephant's assistance, pushes Schmidt off a cliff and he falls to his death. Zandra tries to convince Tarzan to help her people, but Tarzan ignores her, having previously said, "Jungle people fight to live, civilized people live to fight." Zandra plans to return home, but Tarzan stops her. Several Nazis search Tarzan's camp for the radio. They ultimately kidnap Boy, and they presume Tarzan is dead after shooting him out of a tree. Uninjured and hidden from the Nazis by Cheetah's monkey brigade, an angry Tarzan shouts, "Now Tarzan make war!" Tarzan infiltrates the lost city, destroying a machine gun, and killing several Germans. He is temporarily captured, joining Zandra and Boy, but is freed by Cheetah and defeats the German invaders with his knife and an elephant blitzkrieg. In the final scene, Cheetah speaks into the radio; the Nazis in Berlin mistake Cheetah's sounds for the rants of Adolf Hitler.