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Legion follows David Haller (Dan Stevens), a troubled young man who may be more than human. 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 visions might be real.
I'm still unsure about this, honestly, but the team behind FX's FARGO is behind this and it looks pretty good! Also, just happy to hear the word "mutant" be used in a Marvel show. For those curious about the comic character this is based on, here is his bio : David Haller (Earth-616).