Legion is an upcoming TV series based on the X-Men character Legion, also known as David Haller. The show will be developed by FOX and Marvel TV to air on the cable channel FX. The pilot will be written and directed by Noah Hawley.
"The Legion pilot introduces the story of David Haller, a man who may be more than human and who has struggled with mental illness since his teenage years. Diagnosed as schizophrenic, David has been in and out of psychiatric hospitals for years. But after a strange encounter with a fellow patient, he is confronted with the possibility that the voices he hears and the visions he sees might be real. In the comics, David is the son of X-Men founder Charles Xavier (aka Professor X) and Israeli Holocaust survivor Gabrielle Haller. The character first appeared in New Mutants No. 25 in March 1985."  The series will not take place in the X-Men cinematic universe.
- Dan Stevens as David Haller / Legion
- Rachel Keller as Syd, the female lead
- Aubrey Plaza as Lenny, Haller's best friend
- Jean Smart as Melanie, Haller's therapist