He was demonized by ancient sources and portrayed throughout history as a cruel madman, but was Emperor Caligula really insane or just the product of a mad world? He inherited a vast empire, unimaginable wealth and the love of his people, but Caligulas reign descended into paranoia, depravity and full-blown insanity. Dramatic re-enactments and expert testimony from a forensic psychologist ask whether there could be a medical explanation behind this terrifying mind.