Cassandra Nova Xavier is a supervillain appearing in American comic books published by Marvel Comics, most commonly in association with the X-Men. Created by writer Grant Morrison and artist Frank Quitely, the character first appeared in New X-Men #114. She is a mummudrai, a parasitic life form born bodiless on the astral plane.
Cassandra is the older twin sister of X-Men founder, the telepath Professor X.
