This fun-filled action adventure opens with a wealthy man, Major Sundarrajan who has possession of an antique "sword" as a treasure. Thengai Srinivasan who is constantly eyeing to steal the sword from Major Sundararajan for a longtime with lot of unsuccessful attempts.
On one such attempts Jaishankar saves Major Sundararajan and becomes his trusted guy to protect the sword. Raju (Rajinikanth) is an orphan, who is raised by an alcholic ex-thief M.N Nambiar, is an expert in stealing cars. M.N Nambiar finds Rajinikanth as a child while stealing a car owned by Thengai Srinivasan several years back but he was not aware that the car and the child (Rajinikanth) actually belonged to Major Sundararajan.
At one stage M.N Nambiar finds Thengai Srinivasan in a shopping place, believing that his adopted son Rajinikanth is the son of Thengai Srinivasan he hands Rajini to him as his own son. Thengai Srinivasan, in spite of knowing the truth, accepts Rajinikanth as his son and cleverly employs Rajinikanth to steal the "sword" from Major Sundarrajan, his real father.
While Rajinikanth attempts to steal the sword, Jaishankar keeps resisting him. Despite Jaishankar's efforts Rajinikanth manages to loot the sword but then realizes that he's the missing son of Major Sundarrajan and he himself had been instrumental in stealing his own family treasure for the wrong men.
With the help of Jaishankar Rajinikanth fights with Thengai Srinivasan's gang to successfully restore their family treasure in the right hands.