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