Stepa and Alyona go after the Cossack detachment. But the chieftain refuses to let Stepan into battle. Stepa does not obey and meets Nazar on the battlefield in a decisive battle.

Stepa is trying to disrupt Alyonka's wedding with Nazar, he has proof that there is a Polish spy among the Cossacks. And now Stepa, along with Ivan and Nikita, will have to pass the tests to become a real Cossack and get the right to go to the battle for Moscow. But the guys decide otherwise.

Stepa and his friends find Yesaul Govor in captivity by the Poles, who are preparing to hang him. Nazar manages to convince everyone that Stepa is a Polish spy and he is in danger again, now from the Cossacks themselves.

Stepa tells the Cossacks that he found the Crimeans who kidnapped Govor, but the Cossacks with a hangover are not able to go camping. Stepa, with the help of "modern anti-hopping procedures," quickly puts the Cossacks on their feet and organizes a campaign against the Crimeans. The Cossacks take them by surprise, but immediately find out that they do not have a dialect - the Crimeans sold it to the Poles. In parallel, Lukyan completes the well and Stepa, saying goodbye to friends, dives into it.

The Cossacks decide to send a messenger to Nizhny Novgorod to Pozharsky. Stepa is trying to complete the well and simultaneously learns the Cossack craft. At this time, the dwarf Cossack Irgai reports that the neighboring village has again encroached on their harvest. Stepa suggests solving the problem not by war, but by sports, teaching Cossacks football. After the match, escaping from drunken Cossacks, Stepan runs away into the forest, where he stumbles upon Crimeans who kidnapped Govor.

Stepa learns that because of him, his direct ancestor, Yesaul, is in danger, and therefore the entire Steppe family. The Cossacks receive a dispatch from Pozharsky and decide not to go to the aid of the militia, and Stepa is thrown into a pit because of a dispute with Nazar. Ataman Markov announces the wedding of his daughter Alyonka with the Cossack Nazar.

Nazar is trying to inflict violence on Stepan. He is saved by the daughter of Ataman Alyonka, explaining to the Cossacks that Stepa saved her during the attack of the Crimeans. The chieftain decides to save his life and give him to the "upbringing" of the family of the Cossack Churil, who should teach him Cossack wisdom. While Nazar goes on an expedition to rescue the captive Govor, Stepka tries to earn money so that the bricklayer Lukyan can restore the destroyed well.

Moscow teenager Stepan Govorov failed the annual history exam. As a result, instead of a vacation in Turkey, Stepa's parents send him to his grandmother in a village near Rostov.

Having come into conflict with local teenagers, Stepa accidentally falls into a village well and falls into the past, into a Cossack village in 1612 during an attack on it by the Crimean Tatars. After the fight, Stepa is mistaken for a spy and thrown into a pit. In the morning, at the Cossack circle, the Cossacks decide to execute him.