This movie is not about time travel. It is about the present and the past. There is no present without the past. If you forget, destroy your past in your heart - you and your nation have no future. Cherep (Skull) is a modern radical nationalist in the modern Russia. The other three guys represent other parts of Russian society: student, that gave up on studies for some quick buck, rapper-anti-fa and fourth one - "golden boy". Lost generation, but with a hope.
Their world is going to turn upside down. They all get into the past, to the middle of WWII, where they grandfathers fight with Hitler's Germany. Lessons are to be learned for a present and for the future to be saved.
Imagine someone who gives his life for the his motherland to be told: "In the XXI century, men, dressed in black, will walk on the streets of Moscow and shout "Heil Hitler." If you don't get it, switch "Moscow" to "New York" or the city you live in, and you will understand.
