Anniyan is a 2005 Indian Tamil-language psychological action thriller film written and directed by S. Shankar and produced by V. Ravichandran of Aascar Films. The plot centres on a disillusioned everyman whose frustration at what he sees as increasing social apathy and public negligence leads to a split personality that attempts to improve the system. Vikram stars as Ambi, an idealistic, law-abiding lawyer who has Dissociative identity disorder and develops two other identities: a suave fashion model named Remo and a murderous vigilante named Anniyan. Sadha plays the female lead role. Actors Vivek, Nedumudi Venu, Nassar and Prakash Raj also featured in the film.
Shankar conceived the film in mid-2003 during the post-production period of his previous film, Boys. He based the film on his own life experiences during his formative years when he was disturbed by what he saw around him, and his eventual displeasure with the society. Pre-production for Anniyan began in November 2003 and principal photography in March 2004. The making of the film, which included numerous production delays, took 14 months.