Ballu is a notorious criminal who is wanted by the police for a plethora of crimes. Bright and ambitious Inspector Ram finally arrests him, only to have Ballu escape right under his nose. Ram's girlfriend, Ganga volunteers to go undercover to trap Ballu and help restore Ram's reputation. Things get more complicated however, when Ballu falls for her and she finds that she isn't entirely immune to his charms.
Sharda vows vengeance when her husband is murdered by his two evil cousins, Bhishamber and Bhanu, and she and her two young sons are thrown out on the street. Those sons grow into the upstanding police officer Ram and the easily tempted dreamer Lakhan. If the family is to be avenged, Ram will have to lead his brother away from the path of corruption he's strayed onto, and protect him from the influence of Bhanu and Bhishamber.
Hero is the story of a criminal transforming and evolving as a good person under the influence of love. Jackie is a baddie with a heart of gold though, who has to settle scores with the area's 'Thakur' and his police officer son Sanjeev Kumar. So he opts for kidnapping their soft spot, Radha, Thakur khandaan's only daughter. Radha is given to understand that Jackie and his gang are police people who have taken her away to the safety of jungles because their house has been invaded by dacoits. The rest of the story is about the gang's camaraderie with Radha in sylvan spots and the discovery of truth by Radha.
