"Doctor Jekyll and Mister Hyde"

A double-exposure photograph of the characters of Dr Jekyll and Mr Hyde
Public DomainA double-exposure photograph of the characters of Dr Jekyll and Mr Hyde
The Strange Case of Dr Jekyll and Mr Hyde is a nineteenth century horror novella written by Robert Louis Stevenson.  It portrays a character with a split personality: respectable Dr Jekyll, who is transformed into the evil, monstrous Mr Hyde when he drinks a potion of his own concoction.