Member of Whitehall Conference (as Gerald Andersen)
Gordon Phillott
Civil Sergeant
John Wood
Countryman
George Chisholm
Wine Waiter
Rosemary Scott
Launching Lady
Vincent Ball
Pilot
Frank Duncan
News Announcer
Ed Bishop
American Astronaut (as Edward Bishop)
Bill Edwards
American Astronaut
Laurence Herder
Russian Astronaut
Harvey Hall
Russian Astronaut
Frankie Howerd
Himself
Beverly Bennett
(uncredited)
Michael Caspi
(uncredited)
Paul Cole
(uncredited)
Larry Cross
(uncredited)
Stringer Davis
1st Councillor (uncredited)
Lucy Griffiths
Lady-in-Waiting (uncredited)
Sandra Hampton
April (uncredited)
Robert Haynes
(uncredited)
Murray Kash
(uncredited)
Bruce Lacey
Bandleader (uncredited)
Frank Lieberman
American Civilian (uncredited)
Coral Morphew
Peasant Girl (uncredited)
Carolyn Pertwee
June (uncredited)
Stuart Saunders
Sergeant (uncredited)
Kevin Scott
American Journalist (uncredited)
Did you know?
Trivia
Although other characters from the earlier film appear (PM Rupert Mountjoy and his opposition leader Benter) David Kossoff, who played Kokintz, was the only principal cast member of The Mouse That Roared (1959) who returned to play the same role in this sequel.