Two competing teams of scientists search the African jungles for a secret formula.
Jan Trevor
Mona Andrews
Borno
Dr. Harry Trevor
Dr. Frank Bracken
Prince Samu
Dr. Charles Phillips
Georgia Trevor
Allen
Mrs. Camerford Amster
Henry Andrews
Dr. Carl Neff
Dr. Carl Neff
Jan Trevor as a Boy
Gen. Tichak
Emperor Mena
Navigator (archive footage)
Dr. Pierce
Speaker at Conference
Guard of Mu
Doctor at Conference
Freighter Captain
Grubb, Freighter's Mate
Emperor's Guard / Mu Sentry
Batu
Lancer Officer-in-Charge
Mrs. Henry Andrews
Kutu
