 Edward G. RobinsonTheo Wilkins | Theo Wilkins |
 Rod SteigerPaul Mason | Paul Mason |
 Joan CollinsMelanie | Melanie |
 Eli WallachPoncho | Poncho |
 Alexander ScourbyRaymond Le May | Raymond Le May |
 Michael DanteLouis Antonizzi | Louis Antonizzi |
 Berry KroegerHugo Baumer | Hugo Baumer |
 Sebastian CabotCasino Director | Casino Director |
 Marcel HillaireDuc di Salins | Duc di Salins |
 John BeradinoChief of Detectives | Chief of Detectives |
 Bess FlowersLady at Casino Party (uncredited) | Lady at Casino Party (uncredited) |
| IIda AugustianClaire (uncredited) | Claire (uncredited) |
 Frank BakerCasino Patron (uncredited) | Casino Patron (uncredited) |
| AAlex BallGuest at Ball (uncredited) | Guest at Ball (uncredited) |
| HHerman BelmonteGuest at Ball (uncredited) | Guest at Ball (uncredited) |
 Eugene BordenCustoms Inspector (uncredited) | Customs Inspector (uncredited) |
 Chet BrandenburgClub Patron (uncredited) | Club Patron (uncredited) |
| AAlan CaillouGerald Halsey (uncredited) | Gerald Halsey (uncredited) |
| PPeter CamlinBartender (uncredited) | Bartender (uncredited) |
 Steve CarruthersGuest at Ball (uncredited) | Guest at Ball (uncredited) |
 Jack ChefeBall Dance Participant (uncredited) | Ball Dance Participant (uncredited) |
| OOliver CrossGuest at Ball (uncredited) | Guest at Ball (uncredited) |
| MMarcel De La BrosseFrench Waiter (uncredited) | French Waiter (uncredited) |
| JJack DeeryCasino Patron (uncredited) | Casino Patron (uncredited) |
| MMarga Ann DeightonGovernor's Wife (uncredited) | Governor's Wife (uncredited) |
 Jean Del ValRoulette Croupier (uncredited) | Roulette Croupier (uncredited) |
| GGeorge DeNormandGuest at Ball (uncredited) | Guest at Ball (uncredited) |
 Adolph FaylauerCasino Patron (uncredited) | Casino Patron (uncredited) |
| GGeorge FordCasino Patron (uncredited) | Casino Patron (uncredited) |
| KKenneth GibsonCasino Patron (uncredited) | Casino Patron (uncredited) |
