Juan is a boy whose sister has been evicted by science. Despite his young age, he realizes the problem, and with the intention of finding a solution, he undertakes a long journey during which he will suffer multiple vicissitudes, adventures, and dangers. Some strange beings, who descended from a spaceship, will try to help him, but everything is useless.
| Actor | Role |
|---|---|
| CCarlos JuliáJuan | Juan |
 José NietoViajante / Melchor | Viajante / Melchor |
 Antonio MachínChófer / Baltasar | Chófer / Baltasar |
 Antonio Molino RojoRevisor / Gaspar | Revisor / Gaspar |
| CCarmen López LagarLeñadora | Leñadora |
 María Victoria DuráLucía | Lucía |
 Carlos OteroDirector | Director |
| GGlòria RoigMadre | Madre |
 Santiago RiveroMédico / Pastor | Médico / Pastor |
| MMontserrat PortaFelisa | Felisa |
 José María BlancoSan José | San José |
| LLuis del PuebloRecadero | Recadero |
| SSantiago MiguelHombre / Ángel | Hombre / Ángel |
| RRossy FloresMujer gorda | Mujer gorda |
| EEulalia BoadaMujer 1ª | Mujer 1ª |
| MManolita D. FernándezMujer 2ª | Mujer 2ª |
 María MahorMaría | María |
| MManuel LluentPage | Page |