Ninja Batman

During a clash at Arkham Asylum, Gorilla Grodd activates a time-displacement machine that sends Batman, his allies, and Gotham's most dangerous criminals into feudal Japan. The villains arrive years earlier and establish themselves as warlords, with the Joker ruling from a transformed Arkham Castle.

Stripped of most modern technology, Batman must rely on Catwoman, the displaced Bat-family, and a clan of ninjas to restore the machine. Facing armies, giant fortresses, and familiar enemies armed with historical power, he must adapt the symbol of the Dark Knight to a world of swords and samurai.