After a decade of research, the scientist K. Vaseegaran creates a sophisticated humanoid robot with the help of his assistants, Siva and Ravi, to commission it into the Indian Army. He introduces the robot, named Chitti, at a robotics conference in Chennai. Chitti helps Sana, Vaseegaran’s medical student girlfriend, cheat in her examination, then saves her from being assaulted by a group of thugs in a local train. Vaseegaran’s mentor, Professor Bohra, is secretly engaged in a project to create similar android robots for a German terrorist organisation, but has so far been unsuccessful. The terrorists give him a month to have the robots ready, otherwise they will kill him.
Vaseegaran prepares Chitti for an evaluation by the Artificial Intelligence Research and Development (AIRD) Institute, which is headed by Bohra. During the evaluation, Chitti attempts to stab Vaseegaran at Bohra’s command, which convinces the evaluation committee that the robot is a liability and cannot be used for military purposes. Vaseegaran’s effort to prove Bohra wrong fails when he deploys Chitti to rescue people from a burning building. The robot saves most of them, including a girl named Selvi who was bathing at the time, but she is ashamed at being seen naked on camera. Though Vaseegaran puts his coat around her, and the girl’s mother tries to convince her to come back, the girl flees, only to be hit and killed by a truck. Vaseegaran asks for one month to modify Chitti’s neural schema to enable it to understand human behaviour and emotions, to which Bohra agrees. While nearing the deadline, Chitti becomes angry with Vaseegaran, demonstrating to him that it can manifest emotions.