Onnanu Nammal, a story of Kaloor Dennis and scripted by John Paul released in 1984. P. G Viswambharan is the director and he was the most successful director at that time. Mammootty, Mohanlal and Seema were major stars in this movie.
A novel from popular magazine "Vanitha" was decided to take as a movie by the director P. G. Viswambharan, who chosen Seema as Dr. Bala, though the readers selected Lakshmi for the same. Director was very confident about Seema and movie is released with name "Sandhyakku Virinja Poovu" with Mammootty as a negative imaged hero and Mohanlal as the villain. The movie was a super hit and it changed Seema's image. Seema was noticed as a heroine to handle character type roles and she received many serious, female oriented and good characters of Malayalam Cinema. The Mammootty-Seema pair becomes very popular through "Sandhyakku Virinja Poovu".
Sandhyakku Virinja Poovu, Naanayam, Sandhyakkenthinu Sindhooram, Rugma, Onnanu Nammal, Maniyara, Manithaali, Aa neram Alpadooram, Akshrangal, Aalkoottathil thaniye, Athiraathram, Anubandham, Adiyozhukkukal, Idanilangal, Kaanamarayathu, Gandhinagar Second Street, Karimbin Poovinakkare, and Mahaayaanam are some of the hit movies which they acted together. Mammootty and Seema proved their versatility through all these movies.
Onnanu Nammal was a family hit and ran more than 50 days in many major centers. Mammootty performed well as Sethu and Seema as Nirmala. Mohanlal also played an important role.