Pipì, Pupù and Rosmary are climbing a very high mountain because they believe that the higher they’ll get, the easier it will be for them to locate Mapà. At one point, since on the mountain’s peak there are some geysers, Rosmary has the idea to blow up a hot air balloon.
And so our three friends, now up in a hot air balloon, take flight, convinced that it will be easy to find Mapà now that they can observe the earth from above. Nevertheless, in their enthusiasm to climb higher and higher, Pipì, Pupù and Rosmary don’t realize they have thrown off too much balast and suddenly they find themselves floating between Saturn and Mars with no idea of how they can return to the earth.
In the end, as in so many other cases, it is the Moon who helps them, by weighing down the hot air balloon heavier with lunar rocks.