Billa is a 1980 Indian Tamil-language action thriller film directed by R. Krishnamoorthy and produced by Suresh Balaje. The film stars Rajinikanth, Sripriya and Balaji. It is a remake of Don, a 1978 Hindi film written by Salim–Javed and starring Amitabh Bachchan. The film revolves around Billa, a powerful ganglord who is fatally wounded during an encounter with the police. Wanting to uncover Billa's accomplices, DSP Alexander trains a lookalike simpleton Rajappa to pose as Billa and infiltrate the gang. The rest of the film deals with how Rajappa learns more about Billa's gang, and tries to get all of them arrested.