Médico & Irmã Monstro was released in the year 1971。Médico & Irmã Monstro is also called as Dr Jekyll & Sister Hyde, Tri Jekyllin paluu, Dr. Jekyll og søster Hyde, Dr. Jekyll och syster Hyde, Dr. Jeckyll et sister Hyde, Barbara il mostro di Londra。

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 a gorgeous but evil woman. He needs female hormones for his experiments, so a number of London women meet bloody deaths.