Luther Hargreeves, aka Number One, was raised to be the leader of the Umbrella Academy. After a mission gone wrong left him gravely injured, his father injected him with a serum that gave him enhanced strength — but also a simian-like body. He spent four years alone on the Moon under the belief he was serving a vital mission, only to return home for Reginald Hargreeves’ funeral and discover that he had been misled. Despite his physical strength, Luther is emotionally sensitive, often naive, and struggles to earn the respect of his estranged siblings.