Gabbar Singh Rajput (Akshay Kumar) creates his own vigilante military network called the Anti-Corruption Force (ACF) that eliminates the most corrupt individuals, from all walks of life, in a systematic manner. As pressure builds on Police and Government to track down the man who masterminds these killings, Balbir Singh (Sonu Sood) is specially summoned to head the task. He is aided by Suryam (Prakash Raj) who, though being just a constable in the mammoth Police force, is compelled by his instincts to see through the underlying design. Written by Anonymous

Based in Calcutta during its most unsettled times in the 1970s, the film deals with the inseparable life of Bikram and Bala. The story of 2 boys, boys who became refugees. Refugees who became gun couriers. Gun couriers who became coal bandits, coal bandits who became Calcutta's most loved, most celebrated, most reckless, most fearless, Most Powerful! A story of two happy-go-lucky renegades who came to be known as... GUNDAY! Written by Yash Raj Films