“Fargo” actress Rachel Keller is reuniting with showrunner Noah Hawley for FX’s X-Men drama pilot, “Legion.”

The pilot introduces the story of David Haller, who has struggled with mental illness since he was a teenager. 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.

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In the comics, Haller is a mutant and the son of Professor Charles Xavier, leader of the X-Men.

Keller’s character is unknown.

Hawley will write the pilot and serve as an executive producer along with Lauren Shuler Donner, Bryan Singer, Simon Kinberg, Jeph Loeb, Jim Chory and John Cameron.

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Keller played the role of Simone Gerhardt on Season 2 of Hawley’s “Fargo,” and her other TV credits include “The Mentalist” and “Supernatural.” She is represented by Suskin Management.