"Legion" -- FX's "X-Men" based television series -- was recently ordered to series, and production is already underway. To celebrate, executive producer Noah Hawley unveiled a new behind-the-scenes photo of Dan Stevens' David Haller on his Instagram.

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The show comes from Hawley and stars "Downton Abbey's" Dan Stevens as David Haller, the son of Charles Xavier and a man with mental illness and haunted by voices in his head. "Legion" will also star Aubrey Plaza, Jean Smart, Jeremie Harris, Amber Midthunder, Rachel Keller and Katie Aselton.

"Legion" is in development at cable network FX, with Hawley on board as a producer. According to the official description, "Since he was a teenager, David has struggled with mental illness. Diagnosed as schizophrenic, David has been in and out of psychiatric hospitals for years. But after a strange encounter with a fellow patient, he's confronted with the possibility that the voices he hears and the visions he sees might be real." Set to debut on the network in early 2017, production has begun in Vancouver.