X-Men: Evolution is a Canadian-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.