Attagasam (2004) (அட்டகாசம்) (English: Defiance) is a Tamil film directed by Saran. The film stars Ajith Kumar, Pooja, Karunas, and Babu Antony. The film’s score and soundtrack are composed by Bhardwaj. The story is a full length comedy about Ajith in a dual role as a driving instructor and as a rowdy don.The movie begins with Ajith, a driving instructor leading a happy life with his mother Sujatha. She hides from him the truth that his father, Nizhalgal Ravi, was murdered by a dadha, Babu Anthony. The mother much against the boy’s wish packs off Ajith’s twin brother, who had been witness to the murderer from a close quarter, to a distant town. He goes to Tuticorin and grows to become a gangster there.
When the younger Ajith visits Tuticorin, he comes across his elder brother. Seizing the opportunity, the elder brother kidnaps the younger one and decides to go as the driving instructor to Chennai. Initially, he plans to take revenge on his mother for packing him off from their house at a very young age. However, upon coming across Babu Anthony, he takes up a mission to kill him.