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According to Gordon, crime lord Carmine Falcone was rumoured to have disappeared during Ra's al Ghul's attack on Gotham with many of the other inmates of Arkham Asylum, but he is said to be spending time in prison, tying into Sal Maroni and Gambol fighting for underworld control in The Dark Knight.
Most of his enemies are criminally insane, and locked in the Miskatonic Mental Institution (a play on Arkham Asylum, and H. P. Lovecraft's Miskatonic University in the city of Arkham).
In JLA: The Nail, the Joker is provided with Kryptonian gauntlets and launches an attack on Arkham Asylum, forcing most of the inmates to fight each other before brutally murdering Batgirl and Robin while forcing Batman to watch.
Batman: Arkham City, the 2011 sequel to the 2009 video game Batman: Arkham Asylum
Stirk makes a brief cameo in the beginning of the four-part storyline The Last Arkham, where Jeremiah Arkham, Arkham Asylum's new director, utilizes more barbaric methods to "cure" him.