Laurence Harvey

Dr. Francis Trevelyan

Daliah Lavi

Princess Natasha Romanova

Lionel Jeffries

Stanley Farquhar

Eric Sykes

Wrigley

Eric Portman

British Ambassador

Denholm Elliott

Pond-Jones

Wanda Ventham

Mrs. Winters

Marianne Stone

Mrs. Whitby

June Whitfield

Elsie Farquhar

Colin Blakely

Russian Prime Minister

Robert Flemyng

M.I.5 Director

Bernard Archard

Russian Intelligence Chief

Paul Ford

American General

Michael Trubshawe

Braithwaite

Amy Dalby

Miss Marchbanks

John Forbes-Robertson

M.I.5 Workshop Director

R.S.M. Brittain

Commissionaire

Peter Bayliss

Professor

Barry Cryer

Harold Wilson (voice)

Renée Houston

Lady Blanchflower