[9] In the course of about two-hundred comics, Jeremiah's original character was flanderized, turning from a compassionate doctor who believed he could cure any patient to an "obsessed manic wreck".
[13] Jeremiah was driven mad by the belief he could cure every patient, stemming from his teenage years when he talked a gunman down.
[14] This 'savior complex' lead to trouble in his adulthood when he attempted to send his prisoners to attack the Batman, who had admitted himself to the hospital to stop the criminal Victor Zsasz.
[21] In Knightfall, Bane breaks into Arkham Asylum and frees the inmates as Joker holds Jeremiah at gunpoint.
[22] In Batman: No Man's Land, Jeremiah heads to the ruins of Arkham and finds his late uncle Amadeus' journal.
While the asylum is finishing renovations, workplace accidents begin to pile up, including Killer Croc's tank filtration rupturing, Mr.
Afterwards, Arkham is put into a cell and it's revealed that his personal patients like Hamburger Lady and No Face were all figments of his imaginations.
[25] This is his first appearance as Black Mask as it activated after hearing of Batman's death and threatened escapees with acidic nanites of Blackgate Penitentiary to join him as he raised chaos in Gotham.
His new scheme of new False Face Society didn't last after Firefly found out about the nanites and burned them out, forcing Mask to flee from him but the new Batman and Robin with only Zsasz becoming his new associate.