Bessie Love

Paula White

Lewis Stone

Sir John Roxton

Wallace Beery

Prof. Challenger

Lloyd Hughes

Edward E. Malone

Alma Bennett

Gladys Hungerford

Arthur Hoyt

Prof. Summerlee

Margaret McWade

Mrs. Challenger

Bull Montana

Ape Man

Frank Finch Smiles

Challengers Diener

Jules Cowles

Zambo

George Bunny

Colin McArdle

Charles Wellesley

Maj. Hibbard

Arthur Conan Doyle

Himself

Virginia Brown Faire

Marquette

Nelson McDowell

Lawyer

Gilbert Roland

Extra

Leo White

Percy Potts

Harry O. Hoyt

Director

Arthur Conan Doyle

Author

Marion Fairfax

Screenplay

Earl Hudson

Producer

Arthur Edeson

Director of Photography

George McGuire

Editor

Perc Westmore

Makeup Artist

Cecil Holland

Makeup Artist

Milton Menasco

Art Direction

Marcel Delgado

Special Effects

Willis H. O'Brien

Special Effects

Willis H. O'Brien

Visual Effects