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