Patrick Magee
Marquis de Sade
Ian Richardson
Jean-Paul Marat
Clifford Rose
Monsieur Coulmier
Glenda Jackson
Charlotte Corday
John Hussey
Newly Rich Lady
William Morgan Sheppard
A Mad Animal
Robert Langdon Lloyd
Jacques Roux (as Robert Lloyd)
John Steiner
Monsieur Dupere
Susan Williamson
Simone Evrard
Brenda Kempner
Madame Coulmier
Ian Hogg
Military Representative
Ruth Baker
Mademoiselle Coulmier
Michael Farnsworth
Patient
Tim Hardy
Guard (as Timothy Hardy)