Concluding part of the animated adaptation of Frank Miller's comic book following the adventures of the caped crusader. Batman (voice of Peter Weller) and his teenage sidekick Carrie Kelley (Ariel Winter) continue to fight crime but they face a fierce enemy in the Joker (Michael Emerson) who is once again wreaking havoc in Gotham City. To make matters worse, new commissioner Ellen Yindel (Maria Canals-Barrera) disapproves of Batman's methods, along with many others, and the government has ordered Superman (Mark Valley) to bring him down.
The Dark Knight, along with new sidekick Robin, have finally reclaimed Gotham City and allowed a ray of hope to penetrate the reign of terror that The Mutants had cast upon his city. With Batman back in the spotlight, the extended media coverage has awoken a far worse evil at Arkham Asylum, The Joker! Forever destined to be mortal enemies, The Joker has a diabolical scheme that may pull Batman down to the darkest levels of insanity. While on the horizon, a global catastrophe races towards Gotham and with it comes a familiar face, The Man of Steel, though this time he has Batman in his sights. Witness as the aging Dark Knight wages a tireless war against crime while proving that courage and will are indeed timeless.