Do you want to compare Swamp Thing with John Constantine? Discover the powers, weakness & weapons of Swamp Thing and John Constantine from Swamp Thing Biography and John Constantine Biography. Find out all about Swamp Thing and John Constantine.# Check out how is Swamp Thing unique and distinct from John Constantine. Discover their love interest, sidekicks, family tree and the movies and games list in which Swamp Thing and John Constantine have appeared. Find out everything about them here!