Years ago he was a mere simpleton. Living simply in a shanty chawl with his elder brother, Shyamtal (Kader Khan), Bhabhi (Sister-in-law), whom he adored and their daughter Munni. Slacker Kallu's life gets turned around after his brother, Shamu, loses his arms & job in a work-related accident. Kallu goes to the employer, Shahani, and begs him for some money for medical treatment, but Shahani refuses to do so. Apart from them there is no one else in Kallu's Little World until one day, an enemy in the guise of Shahani Seth (Amjad Khan) appears. Shahani shatters the happiness in Kallu's life. In desperation, Kallu breaks-in Shahani's house, and is arrested and sentenced for 9 months in jail. In jail Kallu learns various skills from hardened convicts, and comes out as Kaalia, a person who has only one purpose in life - to get even with Shahani - by hook or by crook.