Billa was directed by R Krishnamurthy (who later came to be known as 'Billa' Krishnamurthy) and produced by thespian producer-director-actor K Balaji who also did one of the most significant roles in the film -- that of DSP Alexander.
It was a dual role by Rajni -- first as a mafia-don who gets knocked off in a police encounter and then as an effeminate street dancer, village bumpkin Billa lookalike, Rajappa.
DSP Alexander, the only person aware of Billa's death keeps it under wraps and persuades Rajappa to impersonate and infiltrate into the Mafia gang as the Don. The aim was to reach their kingpin and bust the gang. Balaji was impressive in underplaying the role of DSP.
Major Sunderrajan and AVM Rajan were also in the cast, the former as the Interpol officer Gokulnath and the latter as Police Officer Varma.
Also read: Takin on Big B and Rajni!