In Ulysses and Lia’s school, students can choose among many extracurricular activities. Against their will, they end up attending the Total Adventure class with professor Hache, an old man of strange and retiring personality. What Ulysses and ...

In Ulysses and Lia’s school, students can choose among many extracurricular activities. Against their will, they end up attending the Total Adventure class with professor Hache, an old man of strange and retiring personality. What Ulysses and Lía don’t know is that the professor hides a great secret and that they are about to go on a frenetic adventure.

Ulysses and Lía carry out, almost involuntarily, their first spaceflight on board the Serendip, professor’s H spaceship. During their journey they find planet Eternia, inhabited only by children, where they are taken for secret agents and are therefore arrested. Will they be able to escape?