What was the first video game in the Batman "Arkham" series?
Explanation
The Batman Arkham series is an action-adventure video game series developed by Rocksteady Studios and published by Warner Bros. Interactive Entertainment. The series takes its inspiration from the DC Comics character Batman and his adventures as the vigilante crimefighter in Gotham City. 'Arkham Asylum' released in August 25, 2009, is the first installment in this franchise. In the game, players control Batman as he attempts to take down the Joker who has taken over Arkham Asylum and threatened to release all of Gotham City's most dangerous criminals.