A high priest tries to force a young beauty to marry a pearl trader who is masquerading as the god Balu.
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!"
A letter from Jane, who is nursing British troops, asks Tarzan's help in obtaining a malaria serum extractable from jungle plants. Tarzan and Boy set out across the desert looking for the plants. Along the way they befriend a stranded American lady magician.
