Batman: Arkham Knight (2015)
Set one year after the death of the Joker during the events of "Batman: Arkham City," Batman is struggling to come to terms with the absence of his nemesis and the uncomfortable feeling that the pair shared a bond deeper than either could admit. Without the Joker's chaotic presence, Gotham's citizens have never felt safer, and crime in the city has dramatically declined. However, this gives Batman's enemies, including Penguin, Two-Face, and Harley Quinn, a chance to unite with the singular goal of killing Batman.
On Halloween, Scarecrow forces the civilian evacuation of Gotham City after threatening to unleash his potent new fear 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. Batman meets with Oracle, who identifies Ace Chemicals as the source of Scarecrow's toxin. Batman investigates the facility but encounters the Arkham Knight and his heavily-armed militia. Batman overcomes the forces and locates Scarecrow, who has transformed the entire building into a toxin bomb. Scarecrow reveals that he has kidnapped Oracle, and exposes Batman to the toxin before escaping. Batman inhibits the bomb's blast radius before he is confronted by the Joker.
A flashback reveals that before the Joker died, his infected blood was used in blood transfusions, infecting five people including Batman; Batman, concealing his infection from others, imprisoned the four other recipients who were physically and mentally transforming into the Joker. The Joker, now existing as a mental projection produced by the infected blood and fear toxin, frequently appears to taunt Batman, and manipulate his perception of the world around him. After Batman escapes the exploding Ace Chemicals, he tells Gordon that his daughter has been captured. Gordon angrily leaves to find Scarecrow. ...
Did You Know? In Rocksteady continuity, the Batman: Arkham Series is a trilogy going from "Batman: Arkham Asylum," to "Batman: Arkham City," to "Batman: Arkham Knight." DC Comics Writer Geoff Johns was brought on to the project to create "Batman: Arkham Knight's" new villain, Arkham Knight.