'Kochadaiyaan' centers around a war between three kings from different generations. The three kings are played by Rajnikanth, Jackie Shroff and Nassar. Rajinikanth has a double role in the film. He plays Kochadaiyaan, a loyal commander of the emperor as well as Rana whose Kochadaiyaan's son. Kochadaiyaan is a successful commander and the emperor's good friend. He aims to conquer the world and put it under his King's feet.
'Kochadaiyaan' stars Shobana, Aadhi and Sarathkumar too in significant roles. The period film also marks Deepika Padukone's debut in the Kollywood industry.