We follow Charles Xavier, Professor X. On his journey through life from his childhood in the 60s, and his young adulthood in the 80s, and the downfall of his friendship with Magneto, Eric Linwood. All of this leading up to present day in the MCU, set sometime after the first X-Men film. We also see his friendship and relationships with Mystique and Moira MacTaggart, also the formation of the X-men.