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.

Plot

Billa is a powerful ganglord, who, despite being one of the most wanted on the list of Interpol, remains elusive to the police. Along with the police, he makes a few other enemies through his merciless approach in running his organisation, especially when he kills one of his own men, Rajesh, when Rajesh decides to leave the business. This introduces Billa to two new enemies: Reena (Rajesh's fiancée) and Rajesh's sister Radha. When Reena seduces Billa and attempts to have the police arrest him, her plan backfires, as Billa outsmarts her and escapes, and in the process, Reena is killed.