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