A.C.E Chemicals, the place where Batman last fought the Red Hood. Batman deduced that the Red Hood and his gang were concocting a toxic chemical weapon that they planned on releasing throughout Gotham. During their fight, the rail on the scaffolding broke and the Red Hood fell into a vat of chemical waste. The Red Hood was presumed dead but something evil emerged. The man that crawled out would become Batman's greatest enemy... the Joker.
