<p>After the Joker assaults Gotham City Hall, he is caught by Batman and escorted to Arkham Asylum, which temporarily holds many members of the Joker's gang, displaced by a fire at Blackgate Prison. Believing the Joker allowed himself to be captured, Batman accompanies him into the asylum. The Joker's plan is revealed as Harley Quinn takes control of the building's security and the Joker escapes his captors, aided by a corrupt guard who kidnaps commissioner Gordon. The Joker threatens to detonate bombs hidden around Gotham City if anyone tries to enter Arkham, forcing Batman to work alone. While pursuing Quinn to rescue Gordon, Batman is exposed to the Scarecrow's fear toxin and hallucinates, seeing the corpses of his parents talking, and Gordon's death.</p>
<p>Batman fights off Scarecrow and the toxin's influence, and eventually navigates his way to a secret Batcave installation he had hidden on the island, where Batman restocks his gadgets.</p>

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