Edward G. Robinson as Theo Wilkins

Rod Steiger as Paul Mason

Joan Collins as Melanie

Eli Wallach as Poncho

Alexander Scourby as Raymond Le May

Michael Dante as Louis Antonizzi

Berry Kroeger as Hugo Baumer

Sebastian Cabot as Director of Casino

Marcel Hillaire as Duc di Salins

John Beradino as Chief of Detectives

Bess Flowers as Lady at Casino Party

Ida Augustian as Claire

Frank Baker as Casino Patron

Alex Ball as Guest at Ball

Herman Belmonte as Guest at Ball

Eugene Borden as Customs Inspector

Chet Brandenburg as Club Patron

Alan Caillou as Doctor Gerald Halsey

Peter Camlin as Bartender

Steve Carruthers as Guest at Ball

Jack Chefe as Ball Dance Participant

Oliver Cross as Guest at Ball

Marcel De La Brosse as French Waiter

Jack Deery as Casino Patron

Marga Ann Deighton as Governor's Wife

Jean Del Val as Roulette Croupier

George DeNormand as Guest at Ball

Adolph Faylauer as Casino Patron

George Ford as Casino Patron

Kenneth Gibson as Casino Patron

James Gonzalez as Guest at Ball

Herschel Graham as Casino Patron

Sam Harris as Guest at Ball

Lars Hensen as Minor Role (uncredited)

Shep Houghton as Casino Patron (uncredited)

Jonathan Kidd as Seymour (uncredited)

Joseph La Cava as Croupier (uncredited)

Donald Lawton as Henri (uncredited)

Eddie Le Baron as Chemin de fer Dealer (uncredited)

Alphonse Martell as Governor (uncredited)

Luis Mata Jr. as Sandy (uncredited)

Louis Mercier as Casino Attendant (uncredited)

Harold Miller as Casino Patron (uncredited)

King Mojave as Guest at Ball (uncredited)

Forbes Murray as Guest at Ball (uncredited)

George Nardelli as Cellar Club Manager (uncredited)

Monty O'Grady as Casino Patron (uncredited)

Andre Philippe as Page (uncredited)

Francis Ravel as Casino Attendant (uncredited)

Tony Regan as Floorman (uncredited)

Leoda Richards as Casino Patron (uncredited)

Joseph Romantini as Barkeep (uncredited)

Jerry Rush as Casino Patron (uncredited)

Cosmo Sardo as Casino Stickman (uncredited)

Jeffrey Sayre as Croupier (uncredited)

Bernard Sell as Casino Patron (uncredited)

Hal Taggart as Casino Patron (uncredited)