X-MEN #203

As the Xavier Academy reels from Exodus's attack and the Marauders' true goals emerge, the X-Men finally find themselves in a position to take the offensive. But only if Iceman and Cannonball deliberately walk into an ambush from which they may not emerge alive.
FEATURING ENDANGERED SPECIES Chapter 13
Beast's alliance with Dark Beast is put to the test as scientific inquiry turns into cold-blooded murder!