After maiming and killing a number of heroes, such as Guardian, the Creeper and the Martian Manhunter, he seeks out Carrie Kelley, Batman's new partner, a.k.a. Catgirl, intending to kill her in order to exact his final revenge on Batman. Grayson confronts Carrie and Green Arrow in the sewers and engages them in battle. Carrie strikes him with thermite, acid and all sorts of chemicals that cause Grayson to explode, apparently killing him, but Saturn Girl later has a vision of a second encounter between Carrie and Grayson and reveals to Carrie that Grayson (though his identity is not yet revealed at this point) is still alive. Grayson eventually ambushes Carrie in the Batcave and proceeds to beat her brutally, lacerating her lips and breaking her bones one by one. Batman arrives and recognises Grayson when he activates the Batcave's self-destruct and Grayson attempts to shut it down with his old abort code, prompting him to revert to his original form and costume. As Elongated Man takes Carrie to safety, Batman and Grayson contemptuously go over their bleak history together, with Grayson even admitting that despite his harsh treatment, he loved Batman like a father. The two eventually fight, but Grayson remains unharmed by everything Batman throws at him: when Batman beheads him with a Thanagarian axe, Grayson effortlessly catches his head and places it back on his neck. Eventually, Batman hurls himself and Grayson into a pit of lava beneath the Batcave; Grayson falls into the lava and is totally disintegrated, thereby leaving nothing left of Grayson for him to grow back, while Batman is rescued by Superman. As Grayson's remains disappear, Batman acknowledges his ward's demise with a sad "So long, Boy Wonder".
After maiming and killing a number of heroes, such as Guardian, the Creeper and the Martian Manhunter, he seeks out Carrie Kelley, Batman's new partner, a.k.a. Catgirl, intending to kill her in order to exact his final revenge on Batman. Grayson confronts Carrie and Green Arrow in the sewers and engages them in battle. Carrie strikes him with thermite, acid and all sorts of chemicals that cause Grayson to explode, apparently killing him, but Saturn Girl later has a vision of a second encounter between Carrie and Grayson and reveals to Carrie that Grayson (though his identity is not yet revealed at this point) is still alive. Grayson eventually ambushes Carrie in the Batcave and proceeds to beat her brutally, lacerating her lips and breaking her bones one by one. Batman arrives and recognises Grayson when he activates the Batcave's self-destruct and Grayson attempts to shut it down with his old abort code, prompting him to revert to his original form and costume. As Elongated Man takes Carrie to safety, Batman and Grayson contemptuously go over their bleak history together, with Grayson even admitting that despite his harsh treatment, he loved Batman like a father. The two eventually fight, but Grayson remains unharmed by everything Batman throws at him: when Batman beheads him with a Thanagarian axe, Grayson effortlessly catches his head and places it back on his neck. Eventually, Batman hurls himself and Grayson into a pit of lava beneath the Batcave; Grayson falls into the lava and is totally disintegrated, thereby leaving nothing left of Grayson for him to grow back, while Batman is rescued by Superman. As Grayson's remains disappear, Batman acknowledges his ward's demise with a sad "So long, Boy Wonder".