Dr. Wells is the true Serial Killer, intending to harvest enough flesh to create a perfect synthetic skin so he can be famous and satisfy a savior complex. Targeting people under the full moon, Wells kills them with a scalpel and takes so much flesh that it appears the victims have been cannibalized. Upon investigation, Wells murders one of the other suspects, targeting all around him while trying to murder his employer's daughter Joan to take her skin as well.
The Return of Doctor X (In Name Only sequel): Dr. Maurice Xavier, aka Marshall Quesne, was a depraved Mad Scientist who decided to starve babies to see how long they could last without eating. Executed for his crimes, he was later revived by a fellow doctor who saw him as a "martyr to science". Xavier decides to stay alive by preying on individuals with a rare blood type his revived body needs. Killing multiple innocents with sadistic relish, he murders his partner when the man realizes what a monster he is and attempts to abduct and kill the hero's sweetheart for her own blood.
Fridge Logic: Not until the fifth victim is it discovered that the bodies have been cannibalized?
