After a terrible accident, little Mush is filled with fear: he is afraid of the dark, he is afraid that he will no longer be able to walk, he is afraid of losing his father and never returning to his former life. But one fine day, or rather, one fine night, when he, covered under a blanket, is trying to hide from his fears, a strange guest visits him. A small strange creature, Pspsik, who accidentally fell into the Outer World from the boy’s own dream, begs to save him and return him to his native Inner World. With the help of Pspsik, the boy finds his forgotten friend Lusunik, accompanied by whom the strange trio sets off for the wonderful land of Mush’s dreams. On the way, they meet amazing creatures and go through many trials.