Swamp Thing is a super hero with the power to manipulate plant life and is a member of the Justice League. He was summoned to the House of Mystery by Constantine after he got a distress call from Batman. In Green Arrow's plan to throw off Nyorlath's power stripping spell, Swamp Thing posed as Plastic Man. In the rematch, Swamp Thing made the first move and smashed Abnegazar into a wall then together with Green Arrow, uppercut Nyorlath. However, Black Adam emerged from the reopened volcanic fissure the Brothers targeted and turned them into monsters. Swamp Thing used Plastic Man as a slingshot and launched Rath. Constantine moved his portal in Rath's path. Swamp Thing helped immobilize Adam so that Shazam and Superman could knock him out together.