In year 3974, the blue planet has turned into the Grey Planet, and the queen, Marina, sends out annual space trips looking for water. Children above 12 can participate, and whoever finds water will get a mysterious prize.
Zoe, Plinio and Calidonia are destined to travel together and, although they don’t get on very well at the beginning, they will have to join forces to fulfill their goal and avoid the tricks by capsule 3Q3, commanded by cheating hacker Plutonius and his minions Sulphur and Urania. Will they be able to find the new source of water?