Egon and Dönci are two lonely inhabitants on a distant solar-system's tiny planet. Egon is an amateur space-explorer dogged by constant ill fortune caused mostly by his cat, Dönci. The film puts on the two figures' comic conflicts, vicissitudes, as they get into all kinds of staggering adventures while exploring the sensible existence far away from earth. They live through every situation in a peculiar way. Egon and Dönci never talk, but communicate with each other and with the viewer in the most simple way - childlike mimicry, one syllable sounds, gestures. In this way they are understood by the youngest age-group as well as the elder on any part of the Earth.