Fargo's Rachel Keller has been cast in a yet-unknown role on FX's X-Men spinoff TV pilot

Rachel Keller in Fargo.

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The potential series focuses on the story of David Haller, the alleged son of Professor X who was previously diagnosed with Schizophrenia before realizing his supposed illness was actually something more.Fargo's executive producer/showunner Noah Hawley will pen the pilot and serve as an executive producer on Legion alongside EP's Laruen Shuler Donner, Bryan Singer, Simon Kinberg, Jeph Loeb, Jim Chory, and John Cameron, with the project one of two X-Men TV spinoffs that involve 20th Century Fox and Marvel directly joining forces for the first time behind-the-scenes.Keller, who played Simone Gerhardt in Fargo: Season 2 for Hawley, also has appeared on The Mentalist and Supernatural. Legion is expected to begin shooting later this month, so the casting of David Haller should be coming soon.

Cassidee is a freelance writer and the co-host of a freelancing podcast and a geek culture podcast . You can chat with her about comics, video games, and Corgis on Twitter