Honest police officer Sethupathi (Kamal) arrests four high profile crooks Dharmaraj (Nagesh), Francis (Delhi Ganesh), Nallasivam (Nasser) and Satyamoorthy(Jaishankar). They get out of jail, kill Sethupathi and poison his pregnant wife. She somehow gives birth to twins, who are separated and grow up as Appu (Kamal) a circus clown, and Raja (still Kamal) a mechanic. Eventually Appu finds out about his father's death and plots his vengeance.