In 1920, filmgoers were treated to no fewer than two different film versions of Robert Louis Stevenson's Dr. Jekyll and Mr. Hyde. In this one, John Barrymore plays the humanitarian Dr. Henry Jekyll, who becomes obsessed with the notion of separating the good and evil impulses within every man.
To this end, he develops a potion which unleashes his own darker side: the demonic Mr. Hyde. This was the adaptation which established the cliché of having both a good and bad leading lady, to parallel the doppelganger aspects of the Jekyll/Hyde personality.
Martha Mansfield is the good girl, while Nita Naldi, wearing costumes that were daring indeed in 1920, is the bad one.
The adaptors also borrowed the character of Lord Henry from Oscar Wilde's The Picture of Dorian Gray in order to provide Jekyll with an evil mentor/blackmailer. Sadly, Dr. Jekyll and Mr. Hyde proved to be one of the last starring films for leading lady Martha Mansfield: she died horribly during filming of The Warrens of Virginia (1924) when her costume touched a discarded match and burst into flame.