In distant space there is a highly developed civilization of intellectuals that long ago stopped wars and defeated all the diseases that once raged in the Ammavaru galaxy. The most destructive was the last epidemic caused by the X virus. The virus aroused wild aggression in its carriers. Because of him, a total war began that almost destroyed the galaxy. A thousand years have passed. It was believed that the dangerous virus had long been destroyed and the Ammavaru galaxy lived in complete harmony, having forgotten about wars and diseases. But one day, a long-distance space reconnaissance accidentally discovered a planet on which this virus still exists in huge concentrations. Space is once again in danger. The government sends another scout there to find out whether it is possible to cure the inhabitants, or whether it is worth immediately destroying the planet before the virus spreads again. The planet is called Earth. And its northern part, where the scout landed his ship, is Russia. The alien comes into contact with several representatives of earthlings and gives them unlimited opportunities. Together they begin to secretly treat the Earth from the X virus. But they can’t just get rid of it. Infected carriers launch a counterattack across the planet. The results are unpredictable.