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