Dr. Zackary Uriah "Zack" Addy is a professional forensic anthropologist who worked for the Jeffersonian Institute. He was originally Dr. Brennan's brilliant young assistant at the beginning of the series before he received his doctorate in Forensic Anthropology in the series' second season. In the third season, Dr. Addy was discovered to have been secretly under the influence of the cannibalistic serial killer Gormogon and aiding him from within the Jeffersonian. He was serving time in McKinley Psychiatric Hospital for his part in Gormogon's crimes; eight years later Zack escapes from the hospital to eliminate the rampage of another serial murderer, known as The Puppeteer. He was falsely accused by the real killer to believing that Zack is the Puppeteer. After this incident, Zack recants h