The first season introduces the core characters and lays the foundations for future story lines. Professor X, Cyclops, Wolverine, Storm and Jean Grey make up the original X-Men. As the season develops, the ranks of the X-Men are bolstered by the appearance of Nightcrawler in the first episode,[2] Shadowcat in the second, Spyke in the fifth and Rogue (who originally joins the Brotherhood in the third episode) in the seventh. In the later episodes of this season, Nightcrawler discovers the identity of his birth mother, Wolverine finds answers to his past, Rogue switches sides to join the X-Men, and Xavier's half-brother, Juggernaut, is released from his prison.