They are icons, role models, heroes. But who are Vitali and Wladimir Klitschko, these boxing gentlemen and PhDs who speak four languages, really? Where do they come from and how did they get so far? Will Vladimir dominate the heavyweight for another five years? Will Vitali continue to make politics and possibly one day become president of Ukraine? And will they really keep their promise to their mother never to fight each other? "Klitschko" tells the stirring story of the Klitschkos: from their childhood in the Ukraine, which was marked by the socialist drill, to their first successes as amateurs, their move to Germany and their rise to international boxing superstars. Through exciting conversations with companions and opponents, moving insights into their private lives (for the first time, the Klitschkos' parents appear before the camera) as well as never before seen footage of the exhausting preparations for the fight and the spectacular boxing fights, director Sebastian Dehnhardt creates an intimate and fascinating portrait of two exceptional sportsmen who are above all one: Brothers.