The plot revolves around the members of the experimental canine unit of the SOBR (Special Rapid Response Unit), where a German Shepherd named Rem, nicknamed Rembo, serves. A new member, Stas Demin, joins the team - an experienced special forces soldier who has served in many combat zones. In the unit, Demin recognizes his former comrade Max Kuptsov and gets acquainted with his four-legged companion - Rembo (Rem). Together, they must go through a multitude of dangerous trials and repeatedly test their mettle.