Dr. Vaseegaran creates Chitti, a powerful robot in his own image, but it is rejected by the scientific body AIRD due to its lack of human behaviour and emotions. After a lightning strike triggers emotions in Chitti, he begins to develop human-like feelings. However, Chitti falls in love with Dr. Vaseegaran's fiancée, Sana, and turns against his creator, leading to dangerous consequences.
When an honest cop, Vijay Kumar's family is ruthlessly slaughtered by a politician and his aides, he decides to change his identity and commits his life to bring his daughter up in a serene atmosphere. But some freak events end up compromising his identity and what he does to save his daughter and avenge the death of his family unfurls as Theri.
Muthuvel Pandian, a retired, stern yet compassionate jailer lives a peaceful life with his family, but trouble knocks his door when his cop son’s tryst with an antique mafia gang goes awry and forces Muthu to step back into a dark world he had voluntarily took a break from.
