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