This Historical drama directed by SS Vasan starring Gemini Ganesan and Vyjayanthimala Bali in lead roles, focuses on a prince who grows up to regain his kingdom from the evil minister, who destroyed his family and save the people from his rule.
Chokkalingam Navilur (T. K. Shanmugam) is a diwan at Vanjikottai Kingdom. He with his wife, Sivakami (Pasupuleti Kannamba), is loyal to their King. Chokkalingam without any hesitation accuses that Senathipathi (P.S. Veerappa), the brother of the King's second wife, Maharani Ranthamani Devi (Meenakshi) plotted the prince's killing (Daisy Irani). Found guilty, Senathipathi is banished by the kind but is helped by one of his soldier to stay in the kingdom without anyone's knowledge. He later sets up a fire in the city and stabs the king with his sword. The king before dying tells Chokkalingam to save his daughter Padma (Padmini) and the infant prince and dies later. In order to fulfil the king's desire, Chokkalingam sails to safety with the king's children, leaving his family behind. Soon his wife does the same with her children but is caught by the Senathipathi's army. Leaving her children on the moving boat, she is imprisoned for life at an island prison.
After, 10 years, the grown up Sunder (Gemini Ganesan) plans to arrange his sister's wedding, but it is interrupted by Senathipathi who kidnaps Gowri (Vijayakumari) in Sunder's absence. While returning home for the preparation for the engagement, Sunder spots Gowri with Senathipathi in his vehicle. In order to escape from Senathipathi, Gowri jumps out of the vehicle and dies soon. Sunder who seeks justice from Senathipathi, plans to kill him, only to be captured by his army. After he is found guilty for his action, Sunder is later banished to a jail island where he serves a life imprisonment. There, he gets the chance to meet his mother who is also spending her whole life for her deed. She explains to him about Senathipathi's persecution of his family and the Vanjikottai kingdom. They both soon plan to escape from the prison. However, his mother dies while Sunder falls into the sea and escapes. He soon saved by a ship carrying some slaves to Ratna Island.
There Sunder meets Princess Mandakini (Vyjayanthimala) who is first averse to the attitude of Sunder, who ignores her beauty and does not respond to her assertive and arrogant behaviour. Later she falls for him and gives him special treatment. Though Sunder also likes her, he requests Mandakini to release him in order to find his father and solve the conspiracy in his kingdom. She agrees with all the requests on the condition that he would return within one month. Mandakini provides Sunder with expensive jewelry, clothes and a boat, and sends Sunder to his kingdom. Meanwhile, Chokkalingam who is living in one of the hinterland villages with Padma, is planning a revolution along with Murugan who serves as his spy at Vanjikottai. After the awareness of the revolution is disseminated to the masses themselves in Vanjikottai, Chokkalingam returns to Vanjikkottai to bring down Senathipathi's government. He is later joined by Sunder, Padma, Murugan, Rangamma, Velan and his wife. Sunder acts as a jeweler and deceives Maharani Ranthamani Devi and Senathipathi by gaining their trust. He later invites them to his palace to watch a dance by Padma. He also plans to release Chokkalingam, Murugan and his wife Rangamma who were arrested by Senathipathi during the revolution.
After one month, Mandakini comes to Vanjikottai to search for Sunder. She set up her camp at the border of Vanjikottai and sends her spy to locate Sunder's place. While spotting Sunder and Padma together, her spy mistakes that Sunder is in love with Padma. Mandakini who hears the news approaches Sunder. Unable to explain his situation, Sunder asks Mandakini to watch the show along with Maharani Ranthamani Devi and Senathipathi. Padma overhears their conversation and realizes Sunder's love towards Mandakini and changes her mind by forgetting her love. In the court, while watching the dance performed by Padma, Mandakini is angered by the meaning of Padma's song which indirectly tells her feelings towards Sunder. Soon, Mandakini changes her costume and gives stiff competition in dance to Padma. When Padma almost faints during the rotation, Sunder cuts the chandelier's rope making the chandelier to crash, thus ending the dance competition. Then he orders Velan to drag Mandakini out and tie her into a room. After Senathipathi has become intoxicated, Sunder uses this situation to masquerade as Senathipathi and rescues Murugan and Rangamma from the prison. He also gets to know that Chokkalingam has been brought to the island prison to undergo the death penalty.
Meanwhile, Mandakini who escapes from Velan, joins Senathipathi and divulges details of the secret place where Chokkalingam, Sunder, Padma and others are hiding. In return, she asks him to send Sunder to her in order to live with him. Senathipathi arrests all of them including Sunder. Mandakini realizes that Senathipathi has tricked her, and gathers her army to save Sunder and others. Murugan and the people of Vanjikottai head to Senathipathi's palace to bring down his government. Knowing this, Senathipathi leave the palace for the immediate execution of Sunder's and others death penalty. Murugan gets to know the place where the execution occurs and he brings his people to kill Senathipathi. Mandakini who also arrives there with her army joins the battle to bring down Senathipathi. During the battle, Senathipathi throws his sword at Sunder but hits Mandakini when she tries to protect him. The battle was ended with the murder of Senathipathi and Mandakini died while uniting Padma with Sunder.
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