The second season sees the addition of several new mutants, including Beast, who becomes a teacher at the Xavier Institute and an X-Man, as well as a version of the New Mutants: Boom Boom, Sunspot, Iceman, Wolfsbane, Magma, Multiple, Jubilee, Berzerker, and Cannonball. During the course of the season, it is revealed that the villains who supposedly perished on Asteroid M are actually alive. Sabretooth continues his pursuit of Wolverine, while Magneto continues to work his own agenda. Mystique poses as Risty Wilde, a high school student at Bayville High who befriends Rogue and breaks into the mansion to steal Xavier's Cerebro files. Using the files, she recovers Wanda Maximoff, the Scarlet Witch, Magneto's daughter and Quicksilver's sister. The mentally unstable mutant joins the Brotherhood upon Mystique's return, allowing them to defeat the X-Men in a battle at the Bayville Mall. Before the finale, a pivotal episode aired featuring the telepath Mesmero opening one of three doors that would unleash a mutant known as Apocalypse.