He starts by having Commissioner Gordon lead Batman and Superman to the cave under Crime Alley where King Shazam will infect Superman. Later, Superman appears seemingly "infected" (with Batman listening in.) making their way to the Hall of Justice weapons room. The Batman Who Laughs tells Superman that he plans to infect the world with his serum. He then makes an off-handed comment to Clark that his plan will be like the destruction of Krypton and Lois and Jon won't survive. Superman attacks The Batman Who Laughs, seemingly blowing his cover. However, the whole thing was revealed to be an illusion by Batman, with The Batman Who Laughs praising him saying that he had a similar system on his own world. The Batman Who Laughs' next step is having Scarab (the infected Blue Beetle) hack the Fortress of Solitude and Batcave computers. As this is happening, he begins taunting Clark saying that they were all evil inside and that he will soon know, but as Superman is about to be infected Supergirl catches the tainted Batarang and is unwittingly infected (as the batarang was designed to infect Kryptonians.) As the Legion of Doom signal shines in the sky, The Batman Who Laughs muses to himself that he is on a collision course with Lex Luthor, but isn't too concerned because as he puts it, "Batman always wins." In the "Watchmen" sequel, "Doomsday Clock", the Batman Who Laughs is among the villains who are analyzed by Doctor Manhattan when Guy Gardner uses his power ring to show the constructs of villains that they have faced. The Batman Who Laughs is depicted as having the same abilities as Batman, combined with the twisted nihilism of the Joker. This contributed to the reasons why Batman was forced to ally with the Joker to stop his counterpart, as he anticipated that his other self retained his existing tactical abilities and therefore an alliance between Batman and the Joker was the only thing his counterpart could never anticipate. Hailing from the Dark Multiverse, he is able to see people's dark urges and fears, visualized as alternate realities of their current actions. His characteristic metal crown functions as a futuristic visor made out of "Dark Metal", allowing him to filter these actions and pinpoint his opponents' next moves during combat and manipulate them psychologically by using his knowledge of their fears. Unlike Batman, he opts for lethal weapons that allows him to kill swiftly, including but not limited to machine guns, knives, a chain weapon with a batarang attached at the end and various assortment of bladed weapons.