I, Monster (1971)

I, Monster is a 1971 British horror film directed by Stephen Weeks (his feature debut) for Amicus Productions. It is an adaptation of Robert Louis Stevenson's Strange Case of Dr. Jekyll and Mr. Hyde, with the main characters' names changed to Dr. Charles Marlowe and Mr. Edward Blake.

More at Wikipedia.

Cast:

• Aimée Delamain
• Michael Des Barres
• Peter Cushing
• Richard Hurndall
• Susan Jameson
• Lesley Judd
• Marjie Lawrence
• Christopher Lee
• Ian McCulloch
• George Merritt
• Mike Raven
• Kenneth J. Warren