Grisu was supposed to be Sir Cedric's watchdog. But since he has not proven himself, he just becomes a simple household dog. When the little dragon is supposed to fetch the newspaper for his master, he sets the whole newsstand on fire with excitement. Nevertheless, Sir Cedric makes him the progenitor of a breeding.

The little dragon is sad because there is still no vacancy at the fire brigade. So he attends the count's railway school, becomes a heater and finally - the locomotive driver of a fast train. One day, when a minister is sitting on his train, a mighty boulder falls on the rails!

In a lonely, wild valley of Scotland live two dragons: Fumé, the father, and Tizzone Grisu, his son. They are the only descendants of a glorious family, to which even King Arthur's court dragon belonged. Fumé is at the service of the local tourism organization. His arts as a fire-breathing dragon are considered a great attraction for holidaymakers. But Grisu doesn't want to spit fire for the tourists. He'd rather be a firefighter. But he is really unlucky: as a firefighter he does not find a position, and in other professions he usually only experiences clean falls. Sir Cedric offers the young dragon the chance to become an astronaut. Grisu first visits the Count's Space Center.

The dragon's father, Fumé, who is already nine hundred years old, tells the little Grisu from his youth: how the Queen quarreled with her father Zampirone; how the bravest stretches lost in the battle against Zampirone; how the Queen decided to use a last resort against Zampirone: the anti-dragon machine "flying oil sardines" ...

Grisu is still struggling to become a firefighter. . That's why he decides to prove himself as a secret agent! In the middle of the night, the hungry Grisu raids Sir Cedric's fridge.