Ewa Aulin

Character: Candy Christian

Charles Aznavour

Character: Hunchback juggler

Marlon Brando

Character: Grindl

Richard Burton

Character: MacPhisto

James Coburn

Character: Dr. A.B. Krankheit

John Huston

Character: Dr. Arnold Dunlap

Walter Matthau

Character: Gen. R.A. Smight

Ringo Starr

Character: Emmanuel

John Astin

Character: T.M. Christian / Jack Christian

Elsa Martinelli

Character: Livia

Sugar Ray Robinson

Character: Zero

Anita Pallenberg

Character: Nurse Bullock

Lea Padovani

Character: Silvia Fontegliulo

Florinda Bolkan

Character: Lolita

Marilù Tolo

Character: Marquita

Umberto Orsini

Character: The Big Guy

Enrico Maria Salerno

Character: Jonathan J. John

Nicoletta Machiavelli

Character: Marquita

Neal Noorlag

Character: Harold

Enzo Fiermonte

Character: Al Pappone

Peter Dane

Character: Luther

Peggy Nathan

Character: Miss Quinby

Anthony Foutz

Character: Mobster

Tom Keyes

Character: Mobster

Mark Salvage

Character: Dr. Harris

Joey Forman

Character: The Cop

Micaela Pignatelli

Character: Girl

Fabian Dean

Character: The Sergeant

Christian Marquand

Character: Film Director (uncredited)

Buck Henry

Character: Mental Patient (uncredited)

Judith Malina

Character: Woman (uncredited)

Julian Beck

Character: Hippie (uncredited)

Romano Targa

Character: Max (uncredited)

International Velvet

Character: Extra