Professor Pyg

Lazlo Valentin is a gifted scientist who suffered a schizophrenic breakdown, which caused him to develop an utterly deranged new persona named "Professor Pyg". Pyg formed the Circus of Strange, began to tour the country, started kidnapping people, leaving a string of mysterious missing-persons cases in his wake. An obsessive perfectionist, Pyg used identity-destroying drugs and invasive surgery on his victims to create a genderless lobotomized human known as Dollotrons.

Unlike other villains who could potentially be rehabilitated (albeit with great difficulty), Pyg's insanity appears to be far worse than that of the other villains Batman has fought over the years and as such, there does not appear to be any particular hope of him fully regaining his sanity.

Upon escaping from Arkham a second time, he captures and brutally tortures Alice Stone, almost killing her, only for him to be found and brutally beaten half to death himself by Hulk. Despite wanting to kill him, Hulk stops himself and sends Pyg back to Arkham.

He has currently taken up permanent residence in Arkham.