Is She Really Charles Xavier’s Sister?
… The answer is, it’s complicated. Charles’ mother, Sharon, was not aware that she was carrying twins during her pregnancy. Cassandra Nova formed within her womb alongside Charles as a spiritual mirror from the Astral Plane—and a particularly dark one. But because she was formed from the genetic potential of Charles himself, she was able to actually create a physical form directly from Charles’ own genome.
Sensing her dark nature in-utero, Charles’ psychic potential awakened as he tried to kill her—the shock of the attempt causing his mother to have a miscarriage. While Charles survived the ordeal, Cassandra was pronounced stillborn—but unbeknownst to doctors, she survived in a primordial physical form, slowly regenerating her body.
