Dalapathi is a dubbed version of Tamil movie Thalapathi and it is action drama based movie in which, Surya (Rajinikanth), is the abandoned child of an 14 year old unwed mother Kalyani (Srividya), is brought up by a generous lady living in slums.
He grows into a fearless kind-hearted slum king who fights the injustice that takes place in town. These qualities lead him to cross swords with the local smuggler Devarajan (Mammooty).
Devarajan's friend is beaten up terminally by Surya, and Deva threatens Surya that Surya will find himself in a dangerous situation if Deva's friend was laid to rest. Soon as his friend passes away, Surya then gets placed in prison.
However, when Deva discovers Ramana's offense, he decides to get Surya released from jail. Surya himself is surprised to see Deva get him out from jail, and there he tells him nyayamnu onnu irrukku (there is such a thing as justice). And from that glorious moment, Deva surrenders his ego and offers his hand of friendship. Surya too declares that he will be Deva's best friend till death.