The winged hedgehog from the planet Blue Kefir is able to fulfill any wish of its owner! Fortunately, Andrei, his friend the robot Bayun and the girl Lavissa managed to get ahead of the space pirate Crox, take the hedgehog to themselves and escape from the pirate using a spatial displacer. But it’s not so easy to escape from the Unknown Planet, where true friends end up. On their way they face many dangerous obstacles: underground digging men, slippery snoring worms and disgusting voracious protoplasm...