Muniyandi (A.V.M. Rajan) makes a honest living as a Rickshaw driver and supports his family consisting of his sister, Kaveri (Sripriya). Their lives take a turn for the worst when Muniyandi is arrested for murder and jailed for three years. Muniyandi breaks out of jail and vows to bring the real culprit to justice.

Valliammai is from a rich family and is a devotee of Lord Karthikeya. She marries Kandan and after many prayers, they are blessed with a son but on the condition that he will die when he turns eight.

Quick Gun Murugun is an unlikely Superhero with Guntastic powers. He is a Sincere South Indian Cowboy who considers it his duty to serve and protect. The movie revolves around mis-adventures of Quick Gun Murugun and his fight with his arch villain Rice Plate Reddy!