Top Secret

George Cole

George Archibald Potts

Oskar Homolka

Zekov

Nadia Gray

Tania

Wilfrid Hyde-White

Sir Hubert Wells

Richard Wattis

Barnes

Irene Handl

Mrs. Tidmarsh

Christopher Lee

Russian Agent (uncredited)

Frederick Leister

Prime Minister

Frederick Valk

Rakov

Geoffrey Sumner

Pike