George Segal as Robby Ross

Jacqueline Bisset as Natasha O'Brien

Robert Morley as Maximilian Van Devere

Jean-Pierre Cassel as Louis Kohner

Philippe Noiret as Jean-Claude Moulineau

Jean Rochefort as August Grandvilliers

Gigi Proietti as Ravello

Stefano Satta Flores as Fausto Zoppi

Madge Ryan as Beecham

Frank Windsor as Blodgett

Peter Sallis as St. Claire

Tim Barlow as Doyle

John Le Mesurier as Dr. Deere

Joss Ackland as Cantrell

Jean Gaven as Salpetre

Jacques Marin as Marcel Massanet

Nigel Havers as Counterman

Struan Rodger as Asst. Director

Anita Graham as Blonde

Aimée Delamain as Old Woman

Jill Goldston as Restaurant Patron (uncredited)

Daniel Emilfork as Saint-Juste

Jacques Balutin as Chappemain

Jean Parédès as Brissac

Michael Chow as Soong

Nicholas Ball as Skeffington

David Cook as Bussingbill

John Carlisle as Actor

Sheila Ruskin as Actress

Kenneth Fortescue as Director

Derek Smith as Man in Corridor

Eddie Tagoe as Mumbala

Caroline Langrishe as Loretta