Ratchagan (transl. Saviour) is a 1997 Indian Tamil-language romantic action film written, produced by K. T. Kunjumon, and directed by Praveen Gandhi in his debut. It stars Nagarjuna and Sushmita Sen in their Tamil debuts, alongside Raghuvaran, S. P. Balasubrahmanyam, Vadivelu and Girish Karnad in supporting roles. The film was released on 30 October 1997. It was the most expensive Indian film at the time of release. Notably, this marks the first and last Tamil film to have Sen in a lead role. The film was opened to mixed reviews, and it was a box office bomb although the soundtrack and background score by A. R. Rahman remained a chartbuster.