Ullathai Allitha is a Tamil comedy movie which is pictured around a father and son relationship. Raja, who is the only son of Colonial Chandrasekhar, is controlled by his father for even a meager decision. When his father forced him to marry a girl of his choice, Raja runs away to Ooty. Raja and his friend Vasu create a confusion among Indu who he was supposed to marry and her father Viswanathan. Unaware of the truth, Viswanathan misunderstands that Vasu is his would-be son-in-law and Raja is his driver. This fun filled movie fills in a lot of humor and thrill.