Willis O'Brien's (King Kong) special effects highlight Arthur Conan Doyle's adventure in a world of prehistoric monsters.
Director: Harry Hoyt
Director: Harry O. Hoyt
Director: William Dowling
Producer: Carl Laemmle
Producer: Sr.
Actor: Bessie Love
Actor: Lloyd Hughes
Actor: Wallace Beery
Actor: Arthur Hoyt
Actor: Margaret McWade
Actor: Finch Smiles
Actor: Frank Finch Smiles
Actor: Virginia Brown Faire
Actor: Lewis Stone
Actor: Jules Cowles
Actor: Bull Montana
Actor: George Bunny
Actor: Charles Wellesley
Actor: Alma Bennett