Edge of Sanity

In this variation on the Dr. Jekyll and Mr. Hyde story, respected physician Henry Jekyll (Anthony Perkins) has been experimenting with cocaine -- which unleashes his alter ego, the uncontrollable Jack Hyde. Under the drug's powerful influence, Hyde has perverted nightmares and explodes into a killing spree, stalking and slashing beautiful prostitutes. The police can't catch him, so he has nothing to lose,but his mind.