Zandra, white princess of a lost civilization, comes to Tarzan for help when Nazis invade the jungle with plans to conquer her people and take their wealth. Tarzan, the isolationist, becomes involved after the Nazis shoot at him and capture Boy: "Now Tarzan make war!"
Tarzan Triumphs is a 1943 adventure film in which Tarzan fights the Germans during World War II. 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.
