Nalla Thanka is a 1950 Indian Malayalam-language mythological film directed by P. V. Krishna Iyer and produced by K. V. Koshy and Kunchacko under the banner of Udaya Studios and K & K Combines. It was the second film produced at the Udaya Studios, the first being Vellinakshatram (1949). The film stars Miss Kumari in the title role along with Augustine Joseph, Vaikom Mani and Miss Omana in other supporting roles. The film is based on the legend of Nalla Thanka, which is based on a popular Tamil folk tale.
Nallannan is the King of Madhurapuri. His sister Nalla Thanka is married to Somanathan, the King of neighbouring country Ratnapuri. Alankari, the wicked queen of Madhurapuri becomes jealous of the happy married life of Nalla Thanka. Years pass and one day, drought strikes Ratnapuri. Nalla Thanka and her seven children seeks refuge in Nallannan's palace. Nallannan promises all help while Alankari tortures Nalla Thanka.