Tondelayo

Hedy Lamarr

Mr. Harry Witzel

Walter Pidgeon

The Doctor

Frank Morgan

Mr. Langford

Richard Carlson

The Reverend Dr. Roberts

Henry O'Neill

Skipper of the Congo Queen

Reginald Owen

Wilbur Ashley

Bramwell Fletcher

Ted, First Mate of the Congo Queen

Clyde Cook

Jim Flash

Leigh Whipper

Umeela

Oscar Polk

Doctor's Houseboy

Darby Jones

Mr. Worthing

Richard Ainley

Seaplane Pilot (uncredited)

Jim Davis

Jim Benson (uncredited)

John Burton

Native Singer (uncredited)

Delos Jewkes

Native Prisoner (uncredited)

Martin Wilkins

Native Drug Seller (uncredited)

Ed Allen