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