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