INFO Dr. Vaseegaran (Rajinikanth), a scientist specialized in robotics, creates a sophisticated android robot (Rajinikanth) in his own likeness after a decade of intensive original research. His mother (Revathi Sankaran) suggests naming it Chitti Babu.
At the International Robotic Conference in India, Vaseegaran introduces Chitti to the delegates. In the meantime, it is revealed that Vaseegaran's mentor, Dr. Bohra (Danny Denzongpa) is preoccupied in a botched research project to create a similar superintelligent android robot. Meanwhile, Chitti endears himself to Vaseegaran's girlfriend, Sana (Aishwarya Rai) and helps her cheat in her medical school exams. When they are caught, Sana lies to the investigators that she does not know Chitti; thus Chitti learns that humans may choose to lie for self-preservation.
Vaseegaran prepares Chitti for a panel evaluation by the Artificial Intelligence Research and Development Institute (AIRD), which is headed by Dr. Bohra. The panel enquires whether Chitti's build conforms to the Three Laws of Robotics of Isaac Asimov. Vaseegaran replies in the negative. During evaluation, Chitti almost stabs Vaseegaran at Bohra's command. Bohra convinces the evaluation committee that Chitti could not be relied upon in the battlefield because he could be easily manipulated to turn against his handlers. Vaseegaran decides to modify Chitti's neural schema to allow him to understand human behaviour and emotions. Chitti eventually gets angry once on Vaseegaran, which assures him and Sana that Chitti can now feel emotions. Later Chitti applies his text book knowledge of symphysiotomy to successfully handle the complicated childbirth of Latha (Devadarshini), Sana's friend. The procedure is covered live by the media. Dr. Bohra arrives to congratulate Dr. Vaseegaran on the achievement. He also lets Chitti pass the AIRD evaluation. Chitti then begins to see Sana as its romantic interest and makes advances. This triggers a confrontation between Vaseegaran and Chitti. Sana tries to explain to Chitti that she can love him only as a friend and asks him to forget her. Chitti later deliberately fails in an evaluation conducted by the Indian Army. Enraged by the act of insubordination, Vaseegaran chops Chitti into pieces and throws it away in a landfill site.
Bohra retrieves Chitti's parts from the junkyard and reassembles the android. He gives Chitti a new appearance, and embeds a "red chip" inside Chitti, thereby converting him into a ruthless terminator. Chitti gatecrashes Vaseegaran and Sana's wedding, then kidnaps and imprisons Sana. Calling himself "Version 2.0", Chitti begins to create replicas and kills Dr. Bohra. Soon Chitti's army of robots cause mayhem in the city, and takes over AIRD HQ. Vaseegaran undertakes the task of stopping Chitti. Disguised as one of the robots, he successfully infiltrates the AIRD headquarters. He instructs the police to cut the power supply in the entire city. When Chitti and his army are about to run out of power, they seize vehicles on the road and use the batteries to recharge themselves. Chitti eventually finds Vaseegaran, but as Chitti is about to kill him, the police force strikes AIRD. The robots assemble themselves into sphere, snake, tower, and drill bit formations to defend themselves. One of the robots is immobilized by a grenade explosion, and is taken into custody by Vaseegaran. He uploads a computer worm into Chitti's network which temporarily brings down the robot army. Chitti identifies the source of the worm and sends a "self-destruct" command to the robot. The robots assemble in the shape of a giant robot and chase Vaseegaran's armoured bus. Vaseegaran uses the data he had backed up from the destroyed robot to de-magnetise the robot army, collapsing the giant formation. Chitti is pulled into the bus by a huge magnetic wall, allowing Vaseegaran access to Chitti's internal control panel, through which he instructs all the other robots to self-destruct. He then removes the red chip, thus calming down Chitti.
In a court hearing, the jury rules capital punishment for Vaseegaran, citing the large number of casualties and damages to public property caused by the robot army. Chitti, explaining to the court that the law allows it to be treated as material evidence, if not as a witness, explains that it was Dr. Bohra who caused Chitti's deviant behaviour. He shows the court, using his eyes as 3D projectors, the video footage of Dr. Bohra installing the red chip inside him. The court decides to drop all charges against Vaseegaran, while concluding that Chitti should be dismantled in order to avoid further mishaps of the same kind in future. Back at the lab, an emotional Vaseegaran tells Chitti to dismantle itself. While taking off its own parts one by one, Chitti apologizes to Sana and Vaseegaran for the problems it had caused. However, before completly dismantling itself, Vaseegaran comforts Chitti saying that the latter alone was not responsible for what happened. Humans were responsible too as Chitti only learned from them. A smiling Chitti finally takes out its head and dismantles itself, with all others around him including Vaseegaran and Sana in tears.
Twenty years later in 2030, school students are escorted by a guide in a museum to a display of Chitti's body parts. The guide tells the students that Chitti was the most advanced humanoid robot ever created, but was dismantled due to "certain reasons". A curious student (Shriya Sharma) asks why, to which Chitti's head responds, "because I started to think"
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