65-year-old Ganeshan has completely lost the zest for life after his wife’s passing. But the news of his 7-year-old grandson Aadith’s visit to India gives him a new lease of life. When all attempts to bond with the superhero fanatic Aadith fail, Ganeshan and his retired friends join in the madness of pretending to be a superhero league. The idea works like a charm. Little Aadith’s excitement knows no bounds when he witnesses a secret meeting of this ‘league’. Ganeshan is elated to receive his grandson’s genuine affection for the first time. But the happiness is short-lived. The very next day a small girl gets kidnapped from their apartment complex. As the police start a preliminary investigation, Aadith turns to his grandfather with a glint of excitement in his eyes. He knows, just like any superhero, his ‘thaatha’ will solve the case in no time. Left with no choice, the old man turns to his ageing cronies. And thus, with aching knees, weak eyesights and greying hairlines, this League of Super (senior) Heroes is set upon their first mission.

Vijay, a cop, is on a mission to apprehend Bhoopathy, a notorious criminal. He infiltrates the gang to become his right hand man. But, in the bargain, he ends up witnessing the killing of his mentor.

Vijay (Arjun) is a hitman who works for Sundaramoorthy (Radha Ravi). He kills anybody for a price, other than women and children and he lives alone in an apartment. Pooja (Pooja), a young girl, studies in a boarding school and comes to her father’s house for the holiday. Between her abusive father, selfish stepmother and an arrogant step-aunt, Pooja feels rather badly but she treasures her lovely little brother Dinesh (Mahanadi Dinesh). Pooja tries to befriend Vijay but Vijay is not interested. Her father is a drug smuggler. One day, a corrupt police officer Jayanth (Raghuvaran) kills Pooja’s family including her brother. Vijay decides to accommodate Pooja and Pooja compels him to teach her his skills as a hitman. What transpires later forms the crux of the story.

Just as everything was falling into place for, a man is distraught when the girl he loves dies in a blast. Fate plays yet another trick on him when he finds himself face to face with her lookalike.