Director: E.R. Cooper; Writer: Muthukulam Raghavan Pillai, K.P. Kottarakkara; Producer: P. Subramanyam; Cinematographer: V. Ramamurthi; Editor: K.D. George; Cast: Lalitha, T.S. Muthaiah, Thikkurisi Sukumaran Nair, Prem Nazir, C.I. Parameshwaran Pillai, T.R. Omana, Adoor Pankajam, Pankajavalli, Muthukulam Raghavan Pillai, S.P. Pillai, Aranmulla Ponnamma, Ragini
Summary: A rich industrialist Prabhu (C. I. Parameswaran Pillai) runs a factory. His son Ravi (Prem Nazir) assists him in all his business projects. Madhu (K. P. Kottarakkara ), the manager of the factory is loyal to his master and the business flourishes. Vikraman (Thikkurissi), the crooked nephew of Prabhu is an employee of the factory. Vikraman tries to manipulate the assets of Prabhu. Ravi is in love with Radha (Lalitha), daughter of a poor farmer and friend of Prabhu. Vikraman also loves Radha and tries to win her love by all crooked means, but in vain. Prabhu brings home Radha when her father dies. Vikraman and his wicked friends Mathu Pillai (Muthukulam Raghavan Pillai) and Pappan (S. P. Pillai) play nasty tricks and try to turn Prabhu against Ravi’s love for Radha. But to their dismay, Prabhu conducts the marriage of his son Ravi with Radha. Prabhu come to know about the nasty tricks of Vikraman and terminates him from the factory. Now Vikraman and his aides try to defame Radha and Prabhu. They spread scandals about the relations between the father-in-law and daughter-in-law, Prabhu and Radha. Suspicion springs up in Ravi also. Sarala (Bharathi Menon), the lady love of Vikraman is engaged to trap Ravi and turn him against Prabhu and Radha. Ravi expels a pregnant Radha from the house. Madhu’s mother (Aranmula Ponnamma) and sister Thulasi (T. R. Omana ) console Radha. Prabhu bring home Radha and he assigns all his wealth in Radha’s name. Sarala who was after the wealth of Ravi, now betrays him.
Vikraman forces Ravi to take revenge on Prabhu and Sarala. Madhu intervenes and saves their lives. Vikraman and his group are arrested by the police. All misunderstandings is cleared, and a reformed Ravi rejoins the family.
Ponkathir was the second movie to come out of Merryland Studios and they needed this to reclaim everything that they lost via that burning wreck of a movie called Athmasakhi (1952), their debut production. The film was dubbed into Tamil with the title Irulukku Pin and released in 1954.