The X-Men are reportedly joining the Avengers, with James Marsden set to reprise his role as Cyclops in the movie Avengers: Doomsday. James Marsden has made comments suggesting that the combination of the two franchises is imminent and highly anticipated. The details of the movie and the extent of the X-Men's involvement are not fully clear, but it appears that a crossover is planned for Avengers: Doomsday.