Over a decade has passed since the United Nations made the controversial decision to outlaw superheroes, a move that followed the tragic murder of Batman's protégé, Robin, played by Jason Todd. Now, in the dystopian landscape of 1986, we find a weary and solemn Bruce Wayne, portrayed by a yet unnamed actor, grappling with the personal demons of alcoholism at the age of 55. With his heroic days behind him, Wayne is deeply estranged from his previous ally and Jason's successor, Dick Grayson. The absence of Batman has allowed Gotham City to spiral into chaos, dominated by a violent gang known as "the Mutants".
Driven by the haunting memory of his parents' murder and the relentless crime wave spawned by the Mutants, Wayne finds himself compelled to don the cape and cowl once more. His return to vigilantism ignites a fire within him as he intervenes against numerous criminal activities, including a harrowing assault against a young girl, Carrie Kelley, portrayed by Rachel Reynolds. As the intensity of the Mutants' crimes escalates, their leader bullies a challenge to Batman, promising to seek personal revenge against him.
News of Batman’s resurgence quickly reaches the Joker, who has been in a catatonic state at Arkham Asylum. This rouses him from his slumber, eager to re-enter Gotham's criminal underworld. Meanwhile, Batman confronts Harvey Dent, who has gone through a transformation with therapy and surgery to leave his past as Two-Face behind, yet his sinister influence lingers as he attempts to hold Gotham ransom with a deadly bomb. Batman's confrontation with Dent marks a turning point, revealing just how twisted the former hero's psyche has become.
The intrigue reaches high stakes when Superman, in dialogue with President Ronald Reagan, contemplates how to handle the resurgence of Batman's lawlessness. In the meantime, Kelley, inspired by her admiration for Batman, acquires a Robin costume and embarks on a quest to locate him. When Batman goes after the Mutants with his Batmobile, the fierce Mutant Leader challenges him to a brutal fight, leaving Batman severely beaten. Kelley’s quick thinking creates a diversion, allowing her and Wayne to retreat to the Batcave where they receive assistance from Alfred Pennyworth, Batman's loyal butler. Recognizing Kelley's courage, Wayne decides to take her under his wing as his new apprentice.
As Batman reasserts his position in Gotham, he strategically dismantles the Mutants’ stronghold, leading to the splintering of their organization into smaller factions. One of these new factions, calling themselves the "Sons of the Batman," begins to adopt combat-driven methods in their crime fighting. During this tumultuous time, Clark Kent is sent to Corto Maltese to engage in a conflict that poses the threat to escalate into a significant global war.
Batman’s actions soon earn the ire of Captain Ellen Yindel, who has taken over from Commissioner James Gordon and subsequently declares Batman a criminal. Meanwhile, the Joker, having manipulated his caretakers at Arkham, emerges onto a television talk show, where he brutally murders the audience with his toxic gas, further solidifying his chaotic reign.
As Batman and Kelley track the Joker to a festive event, they find themselves in a deadly chase against law enforcement. A fierce confrontation occurs between Batman and the Joker, culminating in Batman paralyzing his foe but hesitating to deliver the final blow. Disappointed by Batman's moral boundaries, the Joker ultimately takes his own life, leaving Gotham reeling.
With Gotham embroiled in a citywide manhunt for Batman and escalating pressures from the U.S. government to apprehend him, a critical turning point arrives as Superman diverts a nuclear warhead aimed at the United States, only to be nearly killed in the aftermath. In the shadows, Batman, along with Robin, rallies the remaining Mutants and the Sons of the Batman, tirelessly working to transform Gotham into one of the safest cities in the nation.
The conflict peaks when Superman arrives in Gotham to confront Batman. Despite Superman's attempts at reason, Batman employs his technological mastery to hold his ground. The battle rages until an aging Oliver Queen intervenes, firing a kryptonite-tipped arrow that weakens Superman, allowing Batman to gain the upper hand. However, just when Batman seems victorious, he suffers a heart attack, leading to an apparent death.
In an emotional turn, as Alfred destroys the Batcave in a moment of despair, he succumbs to a stroke. The world believes Bruce Wayne has passed, yet it becomes known that he had staged his death using advanced techniques to bypass the signs of life. During his funeral, Superman, noticing a heartbeat, shares a knowing glance with Carrie, who is now determined to rescue him from his grave.
Finally, looking ahead to a brighter future, Bruce Wayne rises from the ashes, leading Carrie, Queen, and his loyal followers into the depths beyond the Batcave to resume the fight against crime, signaling that the legend of Batman will never truly die.
