Martinka and her friends learn that the Old Wizard, secretly from everyone, is preparing a starship for a flight into space. Soon a Time Hole should open, and it will be possible to get to another planet very quickly. Friends really want to fly into space. They agree to a risky journey, but due to an error in calculations they end up in the future. Now the friends want to return back, but for this they need the help of the fairy Puerta, who promised to help Quack if necessary. The children meet a Chinese boy, Sun Lian. He sheltered them in his home and became a guide in the new reality. But friends urgently need to return back, as they are in serious danger. Fairy Puerta provides them with invaluable assistance, but, having given all her strength, falls into a lethargic sleep. To awaken the fairy and send Sun Lian into the future, the children must find the crystal skull. One of the skulls is hidden on Snake Island, but the search is hampered by a huge number of snakes, as well as bandits who are looking for something on this island.