Modern electric trains replaced the old diesel equipment, and Vityaz was sent to the reserve. But when the city is attacked by aliens who are hunting for energy, the Knight again soars into the sky to save the earth. On new bends he is helped by good old friends and the liner Lightning, with which he again falls in love as a boy.
Nick is a caterpillar boy who, having overcome the taboo of the swamp, becomes a butterfly and, regardless of difficulties, strives for his dream - the Magic jade tree, where all the most beautiful butterflies of the world live. Dangerous trials, fun adventures, new friends and, of course, first love await Nick on his way.
Professor Donovan is treacherously kidnapped by his former assistant, who demands that he reveal the place where the stone is located, which grants universal power to its owner. Donovan's granddaughter, along with the chauffeur Simon, go to help the professor. Dangerous encounters and exciting adventures await them on the way.
