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