John Steed
Dr. Emma Peel
Sir August de Wynter
Invisible Jones (voice)
Mother
Father
Bailey
Alice
Trubshaw
Brenda
Tamara
Donavan
Dr. Darling
Butler
Boodle's Porter
Messenger
World Council of Ministers
Bob (uncredited)
Sheikh (World Council for Ministers) (uncredited)
Professor (uncredited)
Club Member (uncredited)