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