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 (as Sir Cedric Hardwicke) 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 Paul Harvey Colonel Grimes Russell Hicks Commissioner Frank Dae Commissioner Everett Brown Bongo Bobby Burns Geographical Society Delegate Joseph Crehan Morehead Vernon Dent Newspaperman in Office William R. Dunn Chuma Harry Harvey Newspaperman at Water Barrel Darby Jones Chewing Native Robert Middlemass Carmichael Frank Orth Newspaperman with Pills Harry Strang Captain Emmett Vogan Albert