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