Somewhere in the Universe, the PLANET Z. A miracle happens. A water jet springs up and gives birth to a new life: plants. A desert planet became a green planet… Different species cohabit: liquid and sticky mushrooms. But little by little, they invade the green land, and destroy the idyllic life. The toxic spores kill the plants, and transform the planet to a mouldy land… But after destroying all the vegetation, the future of the mould seems to be fearsome. A species cannot live without other ones…