Rosapoo Ravikaikari (1979) was Sivakumar’s 100th film. He debuted in Tamil with A. C. Tirulokchandar’s Kaakum Karangal (1965). His career saw him play the role of God many times in mythological and historical films; he has played Mahavishnu, Muruga, Sage Narada and also Rajendra Chola., and acted in 200 movies, with many of them

Jaga, who is unemployed, marries Gowri, a rich girl who has an intellectual disability. However, things take a turn when he starts liking Ragini, unaware that she is Gowri's sister.

Kavikkuyil, Kavikuyil or Kavi Kuyil is a 1977 Tamil film directed by Devaraj Mohan and starring Sivakumar, Sridevi and Rajnikanth. Fatafat Jayalakshmi plays Rajnikanth's love interest. Sridevi plays the younger sister of Rajinikanth. The film was shot under the S. P. T. Films banner and produced by S. P. Tamizharasi. The film premiered on July 29, 1977.

Thayagu is a teacher who comes to serve in a village. He struggles to attain his desires as he has an unmarried sister and mother to support.

Murali and Shakthi are in love with each other. But unfortunately, his father disapproves of their relationship and he is forced to marry another woman.