"Legion" is a television series based on the Marvel Comics character David Haller, who is the son of Professor Charles Xavier. The show follows David, a young man diagnosed with schizophrenia, as he discovers that his mental illness may actually be a manifestation of his powerful mutant abilities. The series explores themes of identity, mental health, and the nature of reality. Set in a visually striking and surreal world, "Legion" combines elements of psychological drama and superhero fiction. It features a diverse cast, including Dan Stevens as David, and delves into the complexities of his relationships with other mutants, such as Sidney Barrett and Lenny Busker. The show has received critical acclaim for its innovative storytelling and unique visual style.