Major Sundarrajan
Enna Muthalali Sowkiyama
Koteeswaram, a textile mill owner's goons murder Muthiah, secretary of the mill labour union, for demanding bonus and declaring a strike. Muthiah's daughter Jaya, a medical student falls in love with Koteeswaram's son without knowing his identity. Another worker is arrested for Muthiah's murder and his son Sethu and Jaya vow to find out the murderer of Muthiah.
Nallavanukku Nallavan
Manickam, a youngster, gets reformed by Gangadharan, a kind man, who eventually appoints him in charge of his business. Irked by his father's actions, Gangadharan's son seeks revenge against Manickam.
Uyarndha Ullam
Kamal Haasan is very kind person and believes in all. Radharavi befriends him posing as a good person. Using Kamal's weakness for drinking and helping others, Radharavi usurps all his money. Ambika, an employee of Kamal tries to correct him, but of no use. As the property goes to debtors, Kamal becomes a pauper. The change in Kamal's approach to life from this point is the rest of the story.