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.
Starring Johnny Weissmüller, Nancy Kelly, Johnny Sheffield, Otto Kruger, Joe Sawyer, Lloyd Corrigan, Robert Lowery, Frank Puglia, Philip Van Zandt