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