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.
Johnny Weissmüller
as Tarzan
Nancy Kelly
as Connie Bryce
Johnny Sheffield
as Boy
Otto Kruger
as Paul Hendrix
Joe Sawyer
as Karl Straeder
Lloyd Corrigan
as Sheik Abdul El Khim
Robert Lowery
as Prince Selim
Frank Puglia
as Magistrate
Philip Van Zandt
as Kushmet
