A rich estate owner is killed by his second wife and her brother, Aadimoolam (Radharavi). The estate owner's son Raja (Rajnikanth) returns from abroad and learns of this. In order to bring the culprits to book, he makes his friend Sethupati (Janakraj), a rickshaw puller, to impersonate him. Aadimoolam learns of this and kills Sethu and frames Raja as the killer. Raja is sentenced to death. In the same village where Raja lives, there exists his lookalike, Chinnaraasu (Rajnikanth), whose aim in life is to wed his sweetheart Lakshmi (Nadia). Raja escapes from jail and makes Chinnaraasu take his place in jail while he sets out to find Aadimoolam to bring him to justice.