Taylor Holmes
Prof. Arnold Nordstrom
Hal Baylor
Max (Spy Henchman)
Charles Drake
Dr. Ralph Harrison
William Schallert
Johnston - a Reporter
Billy Chapin
Brian 'Gadge' Roberts
Steven Geray
The Foreign Spy-Chief
Lyle Talbot
An Admiral
Henry Kulky
Paul (Spy Henchman)
Karin Booth
Janice Roberts