"Cuando Stink se entera de que Plutón reprobó la Prueba de Planeta por ser demasiado pequeño, no tiene más remedio que ponerse del lado de los planetas chiquitos (y la gente chiquita) de todas partes."--Back cover.

When Stink discovers that Pluto has been downgraded from a planet to a dwarf planet, he launches a campaign in his classroom to restore its status to that of a full-fledged member of the solar system.