There and Back Again '' are scheduled to hit theaters on July 18 , 2014 . McKellen and X. Michael Fassbender have been cast in ` X-Men : Magneto will reprise his role as Magneto and Stewart will be back as Prof. James McAvoy 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 .
McKellen and X. Michael Fassbender have been cast in ` X-Men : Magneto will reprise his role as Magneto and Stewart will be back as Prof. James McAvoy 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 .