He is best known for his playing Matthew Crawley in the period drama Downton Abbey.
But making his return to television in a lead part, Dan Stevens has been cast to join Marvel’s new TV series, Legion.
The 33-year-old will take on the role of David Haller, who is the son of Professor X, and star alongside Aubrey Plaza.
In the pilot episode, Stevens will feature as central character Haller who has battled with mental illness throughout adolescent.
Following a weird encounter with another patient, David discovers that his symptoms which include hearing voices and visions may in fact be real.
The protagonist’s mission to reclaim his sanity is also reignited after he falls in love.
Haller is the son of Israeli Holocaust survivor Gabrielle Haller and X-Men founder Charles Xavier, better known as Professor X.
David, whose alter-ego is Legion, was first introduced in the legendary comic in New Mutants in March 1985.
Meanwhile Plaza is going to star as Haller’s friend Lenny, who somehow manages to remain optimistic about life despite her battles with alcohol and drug abuse.
The pilot written by Noah Hawley will also see appearances from Jean Smart as therapist Melanie, and Rachel Keller as Syd.
Members of Team Marve, Lauren Shuler Donner, Simon Kinberg and Bryan Singer will produce the episode alongside Hawley.
Since leaving Downton Abbey, Stevens went on to star in 2014 film The Guest and next year he will lead the ensemble in the live action version of Beauty and the Beast as the cursed Prince.