Rajinikanth (Dr. Vaseegaran) creates a robot with artificial intelligence and names it as Chitti. As the story moves on, the robot eventually falls in love with a girl called Sharmili (Aishwarya Rai). Love flows freely in the air as the robot starts jotting down romantic poems and starts behaving like a human being. However, things take an ugly turn when the bad guys try to grab hold of the robot to use his extraordinary artificial intelligence for selfish purposes. Dr. Vaseegaran, the scientist fights back to prevent the robot from falling prey to the enemies. Will he able to save the robot? Who will win this battle?