Patrick Magee
— Marquis de Sade
Ian Richardson
— Jean-Paul Marat
Michael Williams
— Herald
Clifford Rose
— Monsieur Coulmier
Glenda Jackson
— Charlotte Corday
Freddie Jones
— Cucurucu
Hugh Sullivan
— Kokol
John Hussey
— Newly Rich Lady
William Morgan Sheppard
— A Mad Animal
Jonathan Burn
— Polpoch
Jeanette Landis
— Rossignol
Robert Langdon Lloyd
— Jacques Roux (as Robert Lloyd)
John Steiner
— Monsieur Dupere
James Mellor
— Schoolmaster
Henry Woolf
— Father
John Harwood
— Voltaire
Leon Lissek
— Lavoisier
Susan Williamson
— Simone Evrard
Carol Raymont
— Patient
Mary Allen
— Patient
Brenda Kempner
— Madame Coulmier
Mark Jones
— Mother
Maroussia Frank
— Patient
Tamara Fuerst
— Patient
Sheila Grant
— Patient
Lynn Pinkney
— Patient
Ian Hogg
— Military Representative
Ruth Baker
— Mademoiselle Coulmier
Michael Farnsworth
— Patient
Guy Gordon
— Patient