Nobby (Sacha Baron Cohen), a sweet, though somewhat silly kibol the English league, meet after years with his lost brother, Sebastian (Mark Strong), an agent of MI6. Unexpectedly, they come together to prevent a global terrorist attack, and the way to prove that the most important is the family.
Nobby has everything. Everything you would expect from a man Grimsby - eleven children, a fantastic (in his opinion) wife (Rebel Wilson) from the north of England, and many minor fraud on the account, which allow him to survive. It lacks only one. He misses his brother, Sebastian, who she has not seen for over 28 years. He has no idea that Sebastian is a secret agent of the British Security Service, who had just discovered the plans for the upcoming global terrorist attack. But that's not all, wrongly accused by their employers, she must hide from him issued judgment. To save lives and the world will have to enlist the help of his brother. Well, the biggest idiot, you can imagine.