Tondelayo
Harry Witzel
The Doctor
Mr. Langford
Skipper of the Congo Queen
The Reverend Dr. Roberts
Wilbur Ashley
Ted - First Mate of the Congo Queen
Jim Fish
Umeela
Darby - The Doctor's Houseboy
Mr. Worthing
Native Drug Seller (uncredited)
Jim Benson (uncredited)
Seaplane Pilot (uncredited)
Native Singer (uncredited)
Native Prisoner (uncredited)