X-Men: Evolution is an American animated television series about the Marvel Comics superhero team X-Men. In this incarnation, many of the characters are teenagers rather than adults. The series ran for a total of four seasons (52 episodes) from November 2000 until October 2003 on Kids' WB, which has made it the third longest-running Marvel Comics animated series, behind only Fox Kids' X-Men and Spider-Man animated series. The series began running on Disney XD on June 15, 2009.
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, 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.