Prof. George Edward Challenger

Claude Rains

Lord John Roxton

Michael Rennie

Jennifer Holmes

Jill St. John

Ed Malone

David Hedison

Manuel Gomez

Fernando Lamas

Prof. Summerlee

Richard Haydn

David

Ray Stricklyn

Costa

Jay Novello

Native Girl

Vitina Marcus

Burton White

Ian Wolfe

Stuart Holmes (uncredited)

John Graham

Prof. Waldron (uncredited)

Colin Campbell

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

Guest at Zoological Institute Forum (uncredited)

Kenner G. Kemp

Guest at Zoological Institute Forum (uncredited)

Cosmo Sardo

Guest at Zoological Institute Forum (uncredited)

Murray Pollack