Experiment in Evil (The Doctor's Horrible Experiment) (1959)

Based on the Novel: "The Strange Case of Dr. Jekyll and Mr. Hyde" by Robert Louis Stevenson. A lawyer, Joly (Teddy Bilis) is disturbed when his friend, the eminent psychiatrist and researcher, Dr Cordelier (Jean-Louis Barrault), makes out a Will leaving everything to a mysterious stranger, Opale. Outside his home, Joly sees a man attack a little girl. When Joly pursues him, he sees the man enter a building belonging to Cordelier. Joly confronts Cordelier's manservant (Jean Topart), who says that his master is out, but that he has given orders that no-one is to enter the laboratory when Opale is in there. Joly is horrified at discovering the man's identity...