Dr Vaseegaran (Rajinikanth) and his android assistant Nila (Amy Jackson) are called in for help after mobiles start mysteriously flying out of the hands of people in Chennai. Vaseegaran summons his trusted robot Chitti (Rajinikanth) to ward off the bird-shaped supernatural powers of Pakshirajan (Akshay Kumar).
A young man walks through his decaying city to approach a hooded figure, and telepathically they exchange funds. He is threatened by a police android and tries to fight back.
Witness the rise of an army soldier as he realizes his destiny and comes to terms to becoming India's first super soldier created to combat terrorists as he fights his inner demons and outer enemies.
Dr. Vaseegaran (Rajinikanth), a scientist specialized in robotics, creates a sophisticated android robot (Rajinikanth) in his own likeness after a decade of intensive research, for commissioning into the Indian army. Vaseegaran explains to his assistants Siva (Santhanam) and Ravi (Karunas) that the android must first be observed for its interaction with humans. His mother (Revathi Sankaran) suggests naming it Chitti.
Alex (C. Arunpandian) and Sivagami (Raadhika Sarathkumar) are honest police officers who are charged to catch the terrorist Jupiter (Naga Kannan). While Murugan is a poor car mechanic living with his mother and beloved sister Meenakshi. Jupiter kills Alex and his family. Soon, Alex is resurrected as a cyborg by scientists. In the meantime, Meenakshi is killed by Murugan's brother Uday (Uday Prakash) and his mother died from heart attack. Alex begins by killing Jupiter's henchmen and partners one by one.