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