The film is set during a cold Russian winter, where Vanyusha and his friends craft a snow sculpture, enjoying the frosty season. As the winter ends and spring begins, the rising temperatures threaten to melt their creation. Determined to save the snow sculpture, Vanyusha and his companions embark on an extraordinary journey into deep space. They find a distant world where the sun has extinguished, leaving the planet in perpetual cold, and leave the snow sculpture there, safe from the warmth of spring.
However, their adventure takes a dangerous turn when they encounter a predatory comet that feeds on spacecraft. After narrowly escaping, they bring the comet back to their village on Earth, where they manage to tame and domesticate the once-hostile celestial entity, turning it into an unusual but welcome part of their community.
