Monsters Inside: The 24 Faces of Billy Milligan (TV Miniseries) (2021)

In 1977, a serial rapist struck Ohio State University. Overwhelming evidence quickly led investigators to Billy Milligan, an aimless young man with a traumatic childhood and a criminal record. Yet upon his arrest, Billy had no memory of the assaults, and his mannerisms seemed to change on the spot. A parade of psychiatrists diagnosed him with multiple personality disorder (now known as dissociative identity disorder), eventually determining that as many as 24 distinct "multiples" existed within his mind. In a case that captivated the nation, their analysis anchored a first-of-its-kind legal defense strategy, and Billy was found innocent by reason of insanity. His trials, however, were far from over.