A brilliant scientist creates a humanoid robot to protect mankind, but things go awry when human emotions are programmed and inner turmoil causes the robot to switch sides. Vaseegaran has spent years on making a human Robot staying away from his family and fiance Sana.When he completes the project he gets him home where his mother names him Chitti.Vaseegaran introduces Sana to Chitti and he helps her in many ways.Proffesor Bohra mentor of Vaseegaran is working on similar project but is unsuccessful.During evaluation he fails Chitti claiming it to just be a machine without any feelings.Vaseegaran then starts to work on Chitti in process of developing feelings towards women.After Chitti starts developing feelings towards human he starts to fall in love with Sana.Vaseegaran sees his project failing and destroys Chitti.Bohra takes advantage of this and re creates Chitti but to cause destruction.