Periyar movie is based on the life of the social reformer Periyar E. V. Ramasamy. The life of Periyar right from a childhood to his marriage to Nagammal to his pilgramage to Kashi which changed his life where he understands the cruelty of the Hindu Caste System that only Brahmins are welcomed and he was refused meals at choultries which exclusively fed Brahmins forbidding other Hindu castes. Having starved severely, Periyar found no other better way than to enter a choultry disguises himself with the appearance of a Brahmin wearing a thread on his bare chest but it is found out and is disgusted with life in Kashi.
Periyar returns and joins his father's business and later becomes the Chairman of the Erode Municipality which he gives and joins the freedom struggle and becames the President of Congress party of Madras Presidency and later quitting and joining the Justice Party and the formation of the DK. His role in the Anti-hindi agitition and Vaikom Struggle. His second marriage and the formation of the DMK. It covers his entire life till death.