Batman overcomes the forces and locates Scarecrow, who has transformed the entire building into a toxin bomb. Batman investigates the facility but encounters the Arkham Knight and his heavily armed militia.
Batman meets with Oracle, who identifies Ace Chemicals as the source of Scarecrow's toxin. Batman tracks Scarecrow to a hideout where he rescues the imprisoned Poison Ivy, who had refused to join Batman's other rogues in Scarecrow's plot. Storyline: On Halloween, Scarecrow forces the civilian evacuation of Gotham City after threatening to unleash his potent new fear toxin.
