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