Arkham is a upcoming TV series which will focus on the film's version of Arkham State Hospital and its inmates.
When revealing that the GCPD spin-off series was not moving forward in March 2022, Reeves explained that it had led to work on a new idea based on Arkham State Hospital. He said the series would build upon Arkham's introduction in the film and explore the origins of different characters related to it. He envisioned a horror tone, with Arkham being depicted as a haunted house. That October, Antonio Campos was hired as a showrunner for the series, in addition to serving as director and an executive producer.