Fan Casting Thomas Wayne, Jr. in Justice League: The Legion of Doom

At the end of Justice League: Crisis On Infinite Earths, Thomas Wayne, Jr./Owlman helped out his brother Bruce, plus his father Thomas, fight off anyone trying to stop the heroes from preventing the multiverse from collapsing, and through this, he realized that what he had been doing to Batman ever since the events of Batman And Robin: The Court of Owls was wrong. After the crisis was put to an end, he bidded his farewells to both Bruce and Thomas, plus the newly redeemed Martha Wayne, before heading back to Earth 3 with the Crime Syndicate to live his own life.