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