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