Ian McKellen and Patrick Stewart have been cast in `` X-Men : Days of Future Past '' as Magneto, Erik Lensherr has joined the film. First Class '' will also portray Magneto and Prof. X . The casting news hints that the next film will reconstitute a 1981 comic book storyline .
Ian McKellen and Patrick Stewart have been cast in `` X-Men : Days of Future Past '' McKellen will reprise his role as Magneto and Stewart will be back as Prof. X. Michael Fassbender and James McAvoy of `` X-Men : First Class '' will also portray Magneto and Prof. X . The casting news hints that the next film will reconstitute a 1981 comic book storyline .