Dan Stevens is set to play the role of a diagnosed schizophrenic in a new X-Men show called Legion. The Downton Abbey star has signed on to the show based on a Marvel comic book.

New Marvel TV series 'Legion' casts Dan Stevens and Aubrey Plaza https://t.co/n9VVIKzfG2 pic.twitter.com/gEhOtv0UsS

— NME (@NME) February 5, 2016

Described as a “haunted man,” Dan Stevens becomes David in the upcoming show–a character who is working to “find his way back to sanity.”

Parks and Recreation alum Aubrey Plaza also stars in Legion. She plays Dan Stevens’ character’s friend Lenny, who is trying to put the pieces of her life–riddled with drugs and alcohol–back together again.

Find out who Dan Stevens and Aubrey Plaza will play in FX's new X-Men show: https://t.co/2UbEdtdLVi pic.twitter.com/wvG3aqaWA3

— Us Weekly (@usweekly) February 5, 2016

Jean Smart of Fargo fame is part of the Legion cast, too. She plays the role of a therapist.

Dan Stevens was beloved by Downton Abbey fans in his role as Matthew Crawley. Aubrey Plaza spent seven seasons on Parks and Recreation as April Ludgate.

Production on Legion is set to begin next month. An air date for the pilot has yet to be released.

What’s your take on this all-star cast for the upcoming X-Men show Legion?

Dan Stevens, Aubrey Plaza, Jean Smart cast in Noah Hawley's X-Men series 'Legion': https://t.co/OX2crtFAqW pic.twitter.com/Y30e9xpCAQ

— Entertainment Weekly (@EW) February 4, 2016

Will you tune in to see Dan Stevens, Aubrey Plaza, Jean Smart, and more in Legion when it airs on FX some time in the near future?