After a shipwreck, Chandrika who's disguised as a man falls in love with Prince Vasanthakumar but he is smitten by Megala Devi. However, Megala falls for Chandrika.

Poori (Daisy Irani) does not know who his parents are, and has been looking high and low to get back to them. Seated in a park bench beside Sundararajan (Gemini Ganesan), Poori asks his name and as soon as he replies, he proclaims that Sundararajan is his father. This creates complications in Sundararajan’s life and ruins his plans of marrying his lover Latha (Savithri). The president of a hospital for the mentally ill with a not-so-mentally-strong daughter creates more problems for the hero. After many interesting twists and turns, the truth emerges — Poori is the illegitimate child of a soldier (Mustafa) and the abandoned mother commits suicide, leaving the child behind. Sundararajan ro and Latha are so attracted to Poori that they decide to adopt him.

A little princess, Ranjani is tattooed with the royal insignia as part of tradition, and the same night, the child is kidnapped by one of the members of the tattoo gang who brings her up as a gypsy girl renaming her Rani. Unaware of her royal lineage, she grows up hawking things on the street and getting into brawls with no punches pulled. She falls in love with a soldier and the story progresses with twists. After several hardships, she realises the truth, and all is well that ends well.

Kula Deivam was based on a Bengali film Banga Kora by noted writer Prabhavathi Devi Saraswathi

After Kattabomman's execution at Kayattar, his brother, Oomadurai, becomes the ruler of the town Sivaganga. Seeing this as an opportunity, the British attack and invade the town with a powerful army.