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