David Randall
Joyce Hendron
Dr. Tony Drake (as Peter Hanson)
Sydney Stanton
Dr. Cole Hendron
Julie Cummings (as Judith Ames)
Dr. George Frye
Harold Ferris
Dr. Emery Bronson
Dr. Ottinger
Rioter Bringing Guns (uncredited)
Traveler (uncredited)
Club Patron (uncredited)
Translator (uncredited)
Delegate (uncredited)
Student (uncredited)
Newsdealer (uncredited)
Eddie Garson (uncredited)
Headwaiter (uncredited)
Complaining Man at Airport (uncredited)
Narrator / U.S. President (voice) (uncredited)
Citizen (uncredited)
Paul (uncredited)
Waiter (uncredited)
French U.N. Representative (uncredited)
Workman (uncredited)
Plane Passenger (uncredited)
Indian U.N. Chairman (uncredited)
Mike (uncredited)
Rudolph Marsden (uncredited)
Scientist (uncredited)
Clerk (uncredited)
Glen Spiro (uncredited)
British U.N. Representative (uncredited)
Leda (uncredited)
Stanley (uncredited)
Chief Customs Inspector (uncredited)
Stewardess (uncredited)
Commuter (uncredited)
Police Officer (uncredited)
Alice (uncredited)
Taxi Driver (uncredited)
Donovan (uncredited)
Matron with Cigarette (uncredited)
Dr. Zenta (uncredited)
Man Drawing Selection Disc (uncredited)