Legion | Season 3: Xavier Preview | FX

He watched. He found. He possessed. Experience Legion’s final reality 6/24 on FX. Subscribe now for more Legion clips: Legion follows the story of “David Haller,” a man who discovered he might be the most powerful mutant in the world. With help from a team of specialists, David learned he’d been haunted by a malicious parasite. Now at odds with everyone he once considered his friends, David enlists the help of a young mutant whose secret ability is the key to his plans to repair