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 Franco of ` ` X - Men : First Class '' will also portray Magneto and Prof. X . EW.com : The casting news hints that the next film will reconstitute a classic 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 Franco of ` ` X - Men : First Class '' will also portray Magneto and Prof. X . The casting news hints that the next film will reconstitute a classic comic book storyline .