Season 8 Episode 22 Doomsday

Despite the threat that Davis poses, Clark can’t take a human life. And thus and so, the Justice League is under the necessity of taking matters into its own hands. Rockk Krinn teleports from the future and gives Clark another time traveling ring which can help him exile Doomsday. In an unexpected twist, while confronting Tess on the subject of her nefarious plan which involves a mysterious crystal, Lois accidentally finds Rokk’s ring and gets swept into the future. Oliver and Clark fight about Doomsday’s human carnage, Chloe ending up caught in the middle. To the end, Clark attempts to use black Kryptonite to split Davis from Doomsday.