Batman Ninja travels through the ages as Gorilla Grodd's time displacement device sends many of Batman's most dangerous foes to feudal Japan, along with the Dark Knight and a handful of his allies. The villains assume the identities of the feudal lords governing the fractured land, with the Joker leading the warring factions. Since his conventional high-tech gear is depleted almost at once, Batman must depend on his wits and his allies—including Catwoman and the wider Bat-family—to bring order back to the region and return to present-day Gotham City.