The world now knows the Xavier Institute’s secret: It’s a home and training ground for mutants. The school opens its gates to them worldwide, accepting over one hundred new students, and the X-Men cope with sudden responsibility and public scrutiny. While anti-mutant protestors shout at the gates, the Xavier Institute forges ahead, determined to be a safe haven for homo sapiens superior.
One student in particular, the Beak, has trouble fitting in and Beast tries to ease his anxiety. Beast experiences anxiety of his own when Trish Tilby, unable to deal with his feline-like mutation, breaks up with him.
Jean seeks comfort from Wolverine due to her marriage troubles, but she asks for more than he can give.
Cassandra reveals that she has taken over Professor Xavier’s body. She viciously attacks Beast and forces the Beak to beat him senseless. Ignorant of the infiltration, the other X-Men proceed as usual while Cassandra plots. Through Professor Xavier, Cassandra organizes a trip through space with Empress Lilandra in a Shi’Ar spaceship, eager to cause destruction from the stars.
She also reveals that she's Charles genetic twin. His sister.