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