Akshay Kumar plays Happy Singh – a village bumpkin in Punjab who causes chaos and mayhem wherever he goes. Now, fed up with his constant trouble, the villagers hatch a plan of packing Happy Singh off. Another son of the soil Luck Singh (Sonu Sood) has gone to Australia but has become an underworld don and so brought shame to Sikhs everywhere. Nicknamed the King, Lucky is known for creating terror and finishing anybody who comes in his way. The villagers use Happy's emotional side to convince him to go to Australia and bring back Lucky to meet his aging parents.

And so off goes Happy and Rangeela (Om Puri) – the only villager who can speak English and will ensure that Happy reaches the King only to be thrown out in less than three minutes. Lucky is in no mood to go up. However the following day Happy finds himself in the middle of a situation where he risks his life to save Lucky from being killed by other gangs after his life. But the incident leaves Lucky paralyzed and our Happy steps into his shoes as King.

However, on the other hand, he meets Rose lady (Kirron Kher) on his first day in Australia who takes him into his home and gives him food. So when Happy who is now Kinng finds Rose lady in trouble, he goes all out to solve her problems. But they only get worse as he finds himself in love with Rose lady's daughter Sonia (Katrina Kaif) who is already engaged to Puneet (Ranvir Shorey).

So what happens next? Will he be able to change the hardened criminals to leave their notorious activities and return to Punjab like the honourable Sikhs they are? And what about his lady love? That's something you need to see the film to find out.