Cast
John Baragrey
Dr. Henry Spensser
Mala Powers
Anne Spensser
Otto Kruger
Dr. William Spensser
Robert Hutton
Dr. John Robert Carrington
Ross Martin
Dr. Jeremy 'Jerry' Spensser
Ed Wolff
The Colossus
Charles Herbert
Billy Spensser
Dick Nelson
Charles - Chauffeur-Butler
Roy Engel
Police Inspector
Charles Sherlock
Airline Pilot
George Douglas
Sam Harris
Larry Kerr
Harold Miller
Foster H. Phinney
Max Power
Jack Richardson
Court Shepard
Bert Stevens
Ed Wolff
Crew
Editing
Floyd Knudtson
Editor
Production
William Alland
Producer
Visual Effects
John P. Fulton
Visual Effects
