Laurence Harvey as Eberlin

Tom Courtenay as Gatiss

Mia Farrow as Caroline

Harry Andrews as Fraser

Peter Cook as Prentiss

Lionel Stander as Sobakevich

Per Oscarsson as Pavel

Barbara Murray as Miss Vogler

Norman Bird as Copperfield

Calvin Lockhart as Brogue

Monika Dietrich as Hedwig

Mike Pratt as Greff

Richard O'Sullivan as Nevil

John Bird as

Geoffrey Bayldon as

James Cossins as

Michael Trubshawe as

Lockwood West as

Geoffrey Lumsden as

Elspeth March as

George Murcell as

Vernon Dobtcheff as

Stefan Gryff as

Geoffrey Denton as

Arthur Hewlett as

John Hamill as Uncredited

James Payne as Taxi Driver (uncredited)