character - Clayton Palmer

character - Calender

character - Lt. Meyerdorf

character - Dr. Bert Dilling

character - Sir Edgar Whipsnade

character - Dr. Carthwright

character - Maj. MacStreet

character - Compton - Cynthia's First Man (uncredited)

character - Sir William Drayton

character - Sergeant (uncredited)

character - Baron de la Ma de la Toulon (uncredited)

character - Cyril

character - Roy Lucas