The Batman Who Laughs, a version of Batman from this Earth, pushed Damian to expose himself with the same type of Joker toxin, which Batman was exposed to when he killed the Joker. He travelled with his father to Earth-0 and he caused problems to Gotham Resistance, Teen Titans and Suicide Squad. He was killed by his counterpart from Earth-0 by using Green Arrow's metallic arrow - one of the ten Metals that could kill anyone from the Dark Multiverse.