Dr. Doug Standish
Lloyd Bridges
Dr. Craig Mosby
Brian Kelly
Captain of the Diligence
Frank Logan
Sonar Man on the Dilligence
Don Wells
Secretary
Celeste Yarnall
Dr. Margaret E. 'Maggie' Hanford
Shirley Eaton
Dr. Philip Volker
David McCallum
Hank Stahl
Keenan Wynn
Dr. Orin Hillyard
Marshall Thompson
Dr. August 'Gus' Boren
Gary Merrill
Brinkman
Ron Hayes
Prof. Uji Hamaru
George Shibata
Vice President
Donald Linton
Producer
Ivan Tors
Director
Andrew Marton
Writer
Arthur Weiss
Visual Effects
Jim Danforth
Set Decoration
Max Pittman
Art Direction
Preston Rountree
Original Music Composer
Harry Sukman
Director of Photography
Clifford H. Poland Jr.
Editor
Warren Adams
Mel Bledsoe
Art Arthur
Associate Producer
Ben Chapman