Charles Aznavour
Hunchback juggler
James Coburn
Dr. A.B. Krankheit
John Huston
Dr. Arnold Dunlap
Walter Matthau
Gen. R.A. Smight
John Astin
T.M. Christian / Jack Christian
Anita Pallenberg
Nurse Bullock
Lea Padovani
Silvia Fontegliulo
Umberto Orsini
The Big Guy
Enrico Maria Salerno
Jonathan J. John
Christian Marquand
Film Director (uncredited)
Buck Henry
Mental Patient (uncredited)
Judith Malina
Woman (uncredited)
Julian Beck
Hippie (uncredited)
Romano Targa
Max (uncredited)