Spencer Tracy
— Henry M. Stanley
Nancy Kelly
— Eve Kingsley
Richard Greene
— Gareth Tyce
Walter Brennan
— Jeff Slocum
Charles Coburn
— Lord Tyce
Cedric Hardwicke
— Dr. David Livingstone
Henry Hull
— James Gordon Bennett, Jr.
Henry Travers
— John Kingsley
Miles Mander
— Sir John Gresham
David Torrence
— Mr. Cranston
Holmes Herbert
— Frederick Holcomb
C. Montague Shaw
— Sir Oliver French
Brandon Hurst
— Sir Henry Forrester
Hassan Said
— Hassan
Paul Harvey
— Colonel Grimes
Russell Hicks
— Commissioner
Frank Dae
— Commissioner
Ernest Baskett
— Zucco
William E. 'Red' Blair
— Sergeant
Everett Brown
— Bongo
Bobby Burns
— Geographical Society Delegate
Jack Clisby
— Mombay
Tom Coleman
— Corporal
Joseph Crehan
— Morehead
Vernon Dent
— Newspaperman in Office
Clarence Derwent
— Sir Francis Vane
William R. Dunn
— Chuma
Harry Harvey
— Newspaperman at Water Barrel
Frank Jaquet
— Senator
Darby Jones
— Chewing Native