Hurvínek, who identifies himself with the heroes of action films, is kidnapped with the Manička ufonky to another planet where aggression rules. Both children are to serve as a sample of human civilization, which the extraterrestrial ruler is about to dominate. Hurvínek, who suddenly finds himself in his harsh world, finds that violence often turns against the one who has caused him. Fortunately, everything goes well. Even Ufoni have their evil ruler just enough. They don't want to fight anymore. They want to play. Hurvínek and Mánička return back to the ground and then leave to look for a new planet where they can play and enjoy life.

1. On the planet Gray Nebula 5:44
2. At home with Mr. Spejbl 5:06
3. Ufon lands 3:47
4. Playground 4:32
5. In the flying plate 4:55
6. At home with Mr. Spejbl 3:06
7. Hurvínek with a man in captivity 4:11
8. Spejbl with Babinka search 4:30
9. 4:09 pm
10. The ruler is preparing a laboratory 2:45
11. Spejbl and Kateřina report the loss of children 3:04
12. Starting key 8:18
13. How to play "hidden" 5:26
14. On the playground 7:42