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