The Red Hood persona, the Ace Chemical break in and Batman's presence seem to be the only consistent events in each retelling; the details of whether Batman threw the Red Hood into the vat, failed to prevent him from falling in or if the criminal jumped in to escape justice seemed to depend on Joker's mood at the time. A younger Batman confronts familiar foes for the first time, with the aid of Alfred Pennyworth Alastair Duncan , who guides both Bruce Wayne and Batman when needed, and the technology he has secretly developed, such as the Bat-Wave. Infiltrating the building, he hacked into Black Mask's computer and found that Sionis had a pacemaker installed and was having the Joker followed. In the elevator, Batman found and scanned the corpse of one of Joker's men, and discovered that he had been poisoned by a neurotoxin that caused powerful hallucinations before eventual death. Batman led a successful twelve-year, crime-fighting career until he was publicly unmasked by Scarecrow during the Arkham Knight Incident.