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