Lord John Roxton
Michael Rennie
Jennifer Holmes
Jill St. John
Prof. Waldron (uncredited)
Colin Campbell
Stuart Holmes (uncredited)
John Graham
Indian Chief (uncredited)
Larry Chance
Reporter at Airport (uncredited)
Bert Stevens
Man at Airport (uncredited)
Al Bain
Guest at Zoological Institute Forum (uncredited)
Bess Flowers
Kenner G. Kemp
Cosmo Sardo
Murray Pollack
Ed Malone
David Hedison
Prof. George Edward Challenger
Claude Rains
Manuel Gomez
Fernando Lamas
Prof. Summerlee
Richard Haydn
David Holmes
Ray Stricklyn
Costa
Jay Novello
Native Girl
Vitina Marcus
Burton White
Ian Wolfe
Director
Irwin Allen
Producer
Screenplay
Visual Effects
Willis H. O'Brien
Novel
Arthur Conan Doyle
Makeup Artist
Ben Nye
Charles Bennett
Set Decoration
Walter M. Scott
Joseph Kish
Original Music Composer
Paul Sawtell
Costume Design
Paul Zastupnevich
Art Direction
Duncan Cramer
Walter M. Simonds
John Sturtevant
Editor
Hugh S. Fowler
Director of Photography
Winton C. Hoch
Bert Shefter
Hairstylist
Helen Turpin
Assistant Director
Ad Schaumer