Though it was initially announced as part of Matt Reeves' blossoming The Batman universe, the filmmaker is now producing the Arkham Asylum TV show as part of the forthcoming DCU, which invites new possibilities for villains. As detailed in Deadline, DC Studios' co-CEO James Gunn confirmed its canonicity. While it's unclear if Antonio Campos will remain as the Max original's showrunner, Batman's more colorful rogues gallery members should make appearances.