In his infamous pitch to Marvel, titled “The Manifesto” and reprinted in trade paperback volumes of New X-Men, Morrison aimed for his X-Men issues to have the same hype as a new Eminem album, which goes to show how aggressively 2001 things were when the series debuted.
Morrison’s New X-Men also introduced a new villain: Cassandra Nova. Because Grant Morrison is, well, Grant freaking Morrison, Cassandra isn’t just a fraternal twin born alongside Charles Xavier but a parasitic mutant who became telepathically linked to Xavier, and thus siphoned some of his powers. Upon being “born,” Cassandra set out to destroy the world, starting with killing 16 million civilians in the mutant country of Genosha.
After a brief body switcheroo with Xavier, Cassandra was eventually “killed” when she became nothing but bodiless energy and trapped in a synthetic brain.