The young Robert Louis Stevenson suffered from repeated nightmares of living a double life, in which by day he worked as a respectable doctor, and by night roamed the back alleys committing crimes. "The Strange Case Of Dr. Jekyll And Mr. Hyde" was originally published in 1886, and became an instant classic about the duality of man.

(1920) John Barrymore stars as Dr. Jekyll and his alter-ego Mr. Hyde in this silent film, using very little makeup for the transformation.

(1932) Fredric March won an Oscar for his portrayal of the title character in "Dr. Jekyll and Mr. Hyde.

Dr. Jekyll: "I'll never take that drug again!" Dr. Lanyon: "It will happen again." Dr. Jekyll: "It never will. I'm sure of it. I'll conquer it!

(1955) "You're a rebel, and see what it has done for you. You're in the power of this monster that you have created.

(1957) A young woman discovers that she is the daughter of the infamous Dr. Jekyll, and begins to believe that she may have a split personality, one of whom is a ruthless killer.

(1963) Jerry Lewis plays both Professor Julius Kelp and Buddy Love in a hilarious update of the Dr. Jekyll & Mr. Hyde story.

(1971) Dr. Chris Leeder finds Dr. Jekyll's notes, then makes and drinks the formula. He turns into Miss Hyde, a sexy blonde who just happens to be a homicidal nymphomaniac!

(1972) Dr. Henry Jekyll, in attempting to find a toxin that will wipe out all common diseases, accidentally stumbles upon a formula that transforms him into the beautiful but evil Sister Hyde.

(1976) A scientist develops a formula to regenerate dying liver cells, but it has the side effect of turning him into an albino vampire that kills prostitutes!

(1989) When Dr. Henry Jekyll's experiments with cocaine get out of control, he transforms into the hideous Mr. Jack 'The Ripper' Hyde. Anthony Perkins plays the title character.

(1995) Richard Jacks, whose job consists of creating and perfecting perfumes, turns out to be the great-grandson of Dr. Jekyll. He concocts a potion that turns him into the wild Ms. Helen Hyde!

(1996) John Malkovich plays Dr. Jekyll and Mr. Hyde. Julia Roberts stars as Mary Reilly, a housemaid who is attracted to both of her employer's personalities.

(1999) The animated version of Dr. Jekyll and Mr. Hyde has been somewhat sanitized for younger viewers.

(2001) Set in Hong Kong, this Jekyll/Hyde character is a fighting champion known as the White Tiger. He battles the Triads, drug trafficking and illegal organ transplants.

(2002) "With every day, and from both sides of my intelligence, the moral and the intellectual, I thus drew steadily nearer to the truth...that man is not truly one, but truly two.

(2003) The League of Extraordinary Gentlemen includes Dr. Jekyll/Mr. Hyde!

(2006) Part crime thriller and part psychological horror story, Mr. Hyde leaves a grisly trail while terrorizing local college students. With the police bearing down on him, Mr. Hyde attacks Dr. Henry Jekyll's girlfriend!

(2007) This BBC TV mini-series stars James Nesbitt as Tom Jackman, a modern-day descendant of Dr. Jekyll who discovers that he shares his ancestor's penchant for transforming into a more animalistic alter ego.