Ewa Aulin
Candy Christian
Charles Aznavour
Hunchback juggler
Marlon Brando
Grindl
Richard Burton
MacPhisto
James Coburn
Dr. A.B. Krankheit
John Huston
Dr. Arnold Dunlap
Walter Matthau
Gen. R.A. Smight
Ringo Starr
Emmanuel
John Astin
T.M. Christian / Jack Christian
Elsa Martinelli
Livia
Sugar Ray Robinson
Zero
Anita Pallenberg
Nurse Bullock
Lea Padovani
Silvia Fontegliulo
Florinda Bolkan
Lolita
Marilù Tolo
Marquita
Umberto Orsini
The Big Guy
Enrico Maria Salerno
Jonathan J. John
Nicoletta Machiavelli
Marquita
Neal Noorlag
Harold
Enzo Fiermonte
Al Pappone
Peter Dane
Luther
Peggy Nathan
Miss Quinby
Anthony Foutz
Mobster
Tom Keyes
Mobster
Mark Salvage
Dr. Harris
Joey Forman
The Cop
Micaela Pignatelli
Girl
Fabian Dean
The Sergeant
Christian Marquand
Film Director (uncredited)
Buck Henry
Mental Patient (uncredited)
Judith Malina
Woman (uncredited)
Julian Beck
Hippie (uncredited)
Romano Targa
Max (uncredited)
International Velvet
Extra