Vaseegaran (Rajnikanth) is a robotics scientist who has been conducting an experiment for ten years before he completes his latest project - an android. He is soon presented with the name of Chitti (Rajnikanth). Sana (Aishwarya Rai Bachchan) is enamoured with her boyfriend’s creation. Vaseegaran’s mentor (Danny Denzongpa) is jealous of his disciple’s success and sets out to destroy Chitti. The film goes on to show how the villain manages to convert the helpful Chitti into a maniacal and destructive robot.