RajiniKanth is Dr. Vaseegaran, a robotics expert who is deeply in love but has no time for his girlfriend Aishwarya Rai (Sana). The reason being Vaseegaran is on the verge of a technical breakthrough in creating the first Humanoid robot (Chitti). Rajini’s crew consists of Santhanam, Karunas and another small robot. Kaadhal Anukkal song and Pudhiya Manidha are the first two numbers in the movie with the former explaining a scientist’s love using his own terminology while the latter would be a background number while Chitti is being created.
Vaseegaran makes Chitti similar to him in appearance. Chitti is the perfect citizen with ethical and moral values and has the capability to learn from the humans he encounters. Chitti with a naturally evoloing AI, interact with other people. Everything goes as per Vaseegaran’s plan of using Chitti for the good of the public. Trouble comes when Aishwarya Rai interacts closely with Chitti. Aishwarya Rai does so innocently because Chitti is just a machine and he resembles her true love, Vaseegaran. However this causes ripples in Chitti's A.I and he starts developing emotions for Aish. Here we get the Irumbile oru Irudhayam song.
Chitti starts behaving like a teen in love, changes appearance and tries to impress Aish. Chitti dance number takes place in a party where Chitti impresses the crowd with his dance moves and finally proposes to Aishwarya. When she refuses, Chitti decides to become adamant and threatens to go rogue. Vasi and Aish tries to talk sense into Chitti and make him understand that he is just a robot. But Chitti rebels. Vaseegaran realizes that it might become messy and decides to terminate Chitti and throws Acid on Chitti and damages it.
Vaseegaran thinks that Chitti is destroyed and proceeds with marrying Aishwarya. However Chitti is salvaged by Danny Dezongpa, a rival robotics engineer who brainwashes Chitti and reverse engineers Chitti to make more such robot clones. He repairs Chitti and gives him the new look. Chitti then goes and kidnaps Aishwarya from the marriage hall. In the meantime Danny makes many Chitti clones and cooks up some sinister plan. Aish realizing that she is trapped decides to play along with Chitti and acts like she is in love with him. Here we have the Arima Arima song. Aish makes Chitti understand the evil intentions of Danny and reminds him his true purpose. She uses Chitti to spoil Danny's plans.
When Chitti confronts Danny he threatens to kill Aish, which enrages Chitti. Also Danny unleashes his Chitti clone army on the city, where they cause a rampage. Chitti finally comes back to his senses and single handedly takes on the clones. Finally Chitti destroys all the clones, the evil scientist and save Aish. Chitti sacrifices his life or destroys himself to protect Aish, Vaseegaran and this world from him or this cursed Robot Technology. All is well and Vasi and Aish are united.
The Birth, emotions and death of Chitti is the message for audience that technology can create a heart even for a machine and break it mercilessly. THE END ----------------------------------- Beeepps--------Beeeps---------- Somewhere a damaged hand of Chiiti’s Clone or lookalike raises from the wreckage with a distorted voice in the background “Sana Sana”------ CONTINUES
