The movie revolves around Dr. Virai (played by Rajinikanth), a brilliant scientist who creates a humanoid robot named Chitti (also played by Rajinikanth). Chitti is a highly advanced robot designed to perform tasks with precision and speed. However, Chitti develops a conscience and becomes emotionally attached to Dr. Virai's daughter, Sana (played by Aishwarya Rai Bachchan).