Law & Order: Special Victims Unit: Season 9, Episode 6

Svengali

A college student is found murdered in an attack that bears the hallmarks of infamous serial killer Robert Morton (Jared Harris). Detectives Benson and Stabler investigate Morton and discover his loyal following, which includes a man whose comic books glorify Morton's murders. When Cecilia (played by Shannon Woodward), the last person to have seen the victim alive, goes missing, the detectives are pressed to save her life. Benson also finds herself in danger when the investigation angers Morton's followers.