David Haller is a troubled young man diagnosed as schizophrenic, but after a strange encounter he discovers special powers that will change his life forever.

"Legion," based on the Marvel Comics by Chris Claremont and Bill Sienkiewicz, is the story of David Haller (Dan Stevens), a troubled young man who may be more than human. Diagnosed as schizophrenic as a child, David has been in and out of psychiatric hospitals for years. Now in his early 20s and free once again, David loses himself in the rhythm of the structured regimen of daily life: breakfast, lunch, dinner, therapy, medication, sleep. David spends the rest of his time in companionable silence alongside his chatterbox friend Lenny (Aubrey Plaza), a fellow patient whose life-long drug and alcohol addiction has done nothing to quell her boundless optimism that her luck is about to change. The pleasant numbness of David's routine is completely upended with the arrival of beautiful, troubled new patient Syd (Rachel Keller). Inexplicably drawn to each other, David and Syd share a startling encounter, after which David must confront the shocking possibility that the voices he hears and the visions he sees could actually be real.—FX Networks

David Haller is a patient in a mental hospital. He has been there for several years now and life is pretty much uneventful. Then one day a new patient, beautiful Syd, arrives and he is immediately smitten. Little does he realize how his life is about to be upended, especially by his discovery of special powers he never knew he had.—grantss

David Haller was diagnosed with schizophrenia at a young age and has been a patient in various psychiatric hospitals ever since. After he has an encounter with a fellow psychiatric patient, he is confronted with the possibility that there could be more to him than mental illness.—priba_dj

David Haller is a troubled mutant whose perception of reality is heavily distorted, yet he may be the most powerful being in existence, and he doesn't even know the extent of his power. Unsure of the world around him, David must confront his demons and find out the truth about himself and his abilities, or the mutant race could be in very real jeopardy.—Johnny-the-Film-Sentinel-2187