Disclaimer: If you haven’t watched Legion yet, I’m sorry in advance but there are going to be a lot of spoiler alerts in this article
Legion is a series that is part of the Marvel Extended Universe and is linked to the X-Men franchise. Linked how? Well, Legion (a.k.a David Haller) is the son of Charles Xavier (that’s Professor X). He is labeled here as being the most powerful mutant ever as has the ability to absorb the powers of a any mutant he comes into contact with. The series provides a back story on Legion and how he got to be who he is.
David Haller is a troubled young man who was diagnosed with schizophrenia as a child. He has been in and out of psychiatric hospitals for years and, now in his early 30s, finds himself institutionalized again. His daily routine — including therapy, taking medications and silently listening to talkative friend Lenny — is upended when troubled new patient Syd arrives, and they are inexplicably drawn to each other. After a startling encounter between the two, David confronts the possibility that the voices he hears and visions he sees may be real. He escapes from the hospital and seeks refuge with sister Amy, who wants to protect the picture-perfect suburban life she has established for herself. Syd eventually gets David involved with therapist Melanie Bird and her team of specialists, who open his eyes to a new world of possibilities.
If you’re waiting for Season 2 (which will have more episodes) you are in for a long wait as it will return in February 2018.