Dr. Henry Jekyll, a seemingly gentle and kind-hearted man of science who owns a bust of the Roman god Janus, has recently developed a theory that a man's evil side can be separated from it's good side. Testing it out by concocting a serum, Jekyll transforms into a charming yet sinister version of himself, Edward Hyde. Taking to the streets of London, Mr. Hyde goes on a rampage, slaughtering, raping and robbing as he pleases. As his good friends and Jekyll's niece try to piece together the puzzle, Hyde might already be in control over Jekyll's life.