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