Flashpoint Beyond #5 was written by Geoff Johns, Tim Sheridan, Jeremy Adams, Xermánico, Mikel Jann, Romulo Fajardo Jr., Jordie Bellaire, and Rob Leigh. Batman/Thomas in Flashpoint Beyond #4.
Wayne discovered that the Clockwork Killer was his wife, Martha Wayne, who had taken on the identity of the Flashpoint Joker. In Flashpoint Beyond #5, Thomas enters Arkham Asylum to confront Martha, which leads to a battle.
In a jail, Martha tells Thomas that she murdered Psycho-Pirate, who had travelled to Flashpoint to escape Dark Crisis. Martha alleges she murdered him after hearing him explain "how the world was changing."
Martha believes Psycho-Pirate told her about the Joker and that Bruce is the Batman of the mainstream DC Universe. "The Joker was a guy," Jack Oswald White once said.
DC has previously dubbed the Joker. In Tim Burton's 1989 Batman film, Jack Napier plays the Joker. The Joker is referred to as Jack Napier in Batman: The White Knight and its sequels.
In the 2019 picture starring Joaquin Phoenix, the Joker's real name is Arthur Fleck. Mitch Gerads, Xermánico, Scott Kolins, Howard Porter, and Tomeu Morey designed the covers for Flashpoint Beyond #5.