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