In the River Clan there is no other kitten as strong and brave as Grozovichok, whose dream is to quickly grow up and become a leader. But fate sends Grozovichka difficult trials - as a result of an accident, he becomes crippled, he is ignored by his fellow tribesmen and his own mother. Suddenly, a mysterious cat begins to appear in Grozovichka’s dreams, which she claims is from the Star Tribe. The stranger is ready to support him in his ambitious plans if Grozovichok gives her a promise to always obey her in everything, and to put the River Tribe above everything else. Having overcome many difficulties, after long and hard training, the main character becomes one of the most powerful and brave warriors of the River Tribe .