A year after the fateful events of Arkham Asailum, many sinister plots are hatching and Sai must stop it... That's the main thing, as to why, Hugo and some TYGER goons burst into DMC, trying to capture Sai. In a very short shoot-out, Trish was shot. Now Sai must go, kick ass and help Batman stop Protocol 10 and the new Joker, who's more powerful than ever before. What will happen?