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