Marvel Must Haves: New X-Men #114–116 #[nn]

In "E Is for Extinction: One of Three," Cassandra Nova accelerates her plan to dominate mutantkind by constructing a new generation of deadly Sentinels. As Hank develops a more advanced Cerebra, its power inadvertently opens Charles's mind to Cassandra Nova’s invasion—placing the X-Men’s greatest minds in grave danger.

In the ashes of Genosha, Jean and Hank race to save Emma from the wreckage, but the cost is staggering—sixteen million mutants lost in an instant. With the world reeling, Charles makes a bold, world-shaking choice: he steps into the spotlight and publicly declares he is a mutant.