On a bright spring morning, a dark cloud of smoke engulfs Gotham City. The fearsome Scarecrow has turned day into night. Surprisingly, the crook doesn't resist Batman's attempt to arrest him. From behind the bars of his cell, the Scarecrow reveals that his evil experiment has already been set in motion. A chemical reaction caused a storm that will create chaos, and it's headed towards Gotham City. Can Batman save the citizens of Gotham from their worst nightmares?