Aaron Cash

Aaron Cash is a major character in the upcoming LEGO Arkham: The Series. He is the head of security at Arkham Asylum, who develops a fear of the inmate, Killer Croc.

"Arkhamverse" Continuity
Aaron Cash helps Dr. Arkham introduce new security protocols for Arkham Asylum. The audience only hears about a "Protocol Nine", however it is implied that these are continued into "Protocol Ten", which will be used by Professor Hugo Strange in Batman: Arkham City.