As the German military advances towards Moscow and the Second World War rages on in Europe, the Soviet Union appears to be on the brink of collapse. Despite this, there is a glimmer of hope in the form of the First Squad - a special unit made up of teenagers with extraordinary abilities. Unfortunately, their only surviving member, Nadya Ruslanova, is suffering from memory loss and cannot take part in the fighting. As the Eastern Front prepares for the next Moment of Truth - a rare event that only occurs once every 700 years and could potentially alter the course of history - a secret German organization known as Ahnenerbe is planning to summon a medieval knight and his army of undead from the underworld. This maneuver could break the stalemate between the warring factions. To prevent this from happening, the First Squad must unite once again, with Nadya at the helm, to bring her fallen comrades back to life and thwart the Nazis' plan for global domination.