"Wolf in the Fold" (S2E14)

Who could be killing all these innocent young women? Is it possibly the man found at each crime scene standing over the bodies holding a bloody knife? Or perhaps the shady square headed man the camera keeps randomly cutting to. Maybe it's even Piglet from Winnie the Pooh being possessed by the three-hundred year old ghost of Jack the Ripper! One thing is for sure: this episode will surely be remembered as screenwriter Robert Bloch's magnum opus.