In the novel “After a Millennium” the reader will again meet the heroes of “Return to the Future” - Nikita Vyazov, Nadya Krylova and their friends - the astronauts. Returning to Earth, where a whole millennium has passed during their stellar wanderings, they are faced with the consequences of an environmental disaster: people have returned to their primitive state and, blaming “aliens from the past” for all their troubles, are determined to take revenge. Salvation comes unexpectedly: it turns out that not all earthlings have gone wild; the astronauts end up on an island where Campanella’s teachings are put into practice.