Gorilla Grodd is the secondary antagonist in Batman Ninja.
History[]
While battling Grodd at Arkham Asylum, Batman, along his allies, enemies and Grodd, were transported back in time to Feudal Japan by Grodd's Quake Engine time displacement machine.
After a brief confrontation with Joker, Batman receives an invitation from Grodd to a nearby hot spring. Grodd explains he intended to send the villains far away so he could take Gotham for himself, but Batman's interference sent them all to feudal Japan instead. Batman and Grodd agree to work together to return to Gotham. Batman, Grodd, Catwoman, the Bat-Family and the Bat Clan battle the Joker and his forces by the river.
They defeat the Joker and Harley, but Grodd turns on Batman, revealing his alliance with Two-Face before the Joker and Harley escape and blow up their own ship, taking Batman down with it. Having captured a power converter from Harley, Catwoman attempts to bargain with Grodd in bringing her back to Gotham; however, they need to obtain other power converters from the Penguin, Poison Ivy and Deathstroke to complete the Quake Engine. Two days later, Batman recovers from his wounds and encourages the Bat-Family to learn the ways of the ninja to defeat Grodd.
A month later, the villains mobilize their castle robots for battle at the "Field of Hell". Batman leads the Bat-Family and the Bat Clan into the battlefield. After defeating the other villains, Grodd puts them under his mind control, with the intent of ruling the country himself. The Joker and Harley, however, crash his party from above, reclaiming their castle from Grodd. The Bat-Family saves Catwoman and Grodd before the Joker merges all of the castles into the super robot Lord Joker.
An injured Grodd gives the control of his army of monkeys to Batman. Robin enables them to merge into one giant samurai monkey to battle the Joker's robot. The samurai monkey then combines with a swarm of bats to form the Batgod to defeat Lord Joker before the Bat-Family storm into the castle to battle the villains. The Joker reveals to Batman that as farmers, he and Harley planted special flowers that restored their memories after blooming. As the castle falls, Batman and the Joker engage in a sword fight. Using his ninjutsu skills, Batman defeats the Joker. With the Joker and the villains defeated, the Bat Clan begins work to restore feudal Japan to its original state and the Bat-Family takes the villains back to the present day where they delivered them to James Gordon.