Dr. Henry Jekyll experiments with scientific means of revealing the hidden, dark side of man and releases a murderer from within himself.
Oliver Reed (Bouncer) played the title characters in Dr. Heckyl and Mr. Hype (1980), another adaptation of Robert Louis Stevenson's "The Strange Case of Dr. Jekyll and Mr. Hyde".
I don't deserve you Kitty.
Kitty Jekyll: You don't. But I deserve you. I deserve nothing better than you.
Robert Louis Stevenson goes unmentioned in the credits. Because the novel is in the public domain, Hammer apparently felt no obligation to bill him.
For the original UK cinema version cuts were made by the BBFC to shorten the scene where the woman dances with a snake, shots of brief nudity during Hyde's bedroom scene with Maria, and a reduction in Hyde's strangulation of her. The 2010 Sony DVD features the restored and uncut UK cinema version.