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