Captain Zelyony, Professor Seleznyov and his daughter
Alisa Seleznyova set out from Earth aboard the Pegas (Pegasus) starship, seeking out new animal species for the Moscow Zoo. Visiting the Moon as a resting point, Seleznyov meets his friend, Gromozeka the alien archaeologist, who advises him to turn to the Planet of Two Captains, a huge museum dedicated to Captains Kim and Buran who went around the whole universe on their ship, the Blue Seagull, for useful information on where the rare animals live. Doctor Verkhovtsev, the director of the museum, is seen visiting the moon as well; however, he avoids Gromozeka. On the Planet of two Captains, the heroes meet Verkhovtsev and ask him to show them the Captain's diaries for directions to find rare animals. But the doctor behaves suspiciously: he refuses to show them the diaries and starts spying on the expedition. Visiting the planet Bluk, the heroes make some valuable purchases, and found out about Chatterbirds — a special kind of birds who could imitate human speech and fly in open space. The heroes found out that they went extinct, and the one responsible for their extinction was none other than Doctor Verkhovtsev. Later, Alisa and Seleznyov spot the Doctor himself on the planet, but an unknown fat alien encounters them and dismisses their claims. A secretive local person, having heard about the heroes' intentions to find a Chatterbird, tells them that he once saved an injured Chatterbird and refused to give it away to the man suspiciously similar to the Doctor. Since he's too afraid to keep the Chatterbird for now, he gives it to the heroes for free. On the way back to the ship, the heroes are ambushed, but manage to defeat their opponents. The fat alien, named Funnyguy Oo, appears as well; he gifts a diamond-shelled tortoise to the heroes and attempts to get the Chatterbird, but to no avail. Soon the bird in question starts talking, and it is found out that it belongs to the captain Kim, who apparently went missing. Having listened to the speech of the Chatterbird, the Pegas crew heads for the Medusa system. On the road, the heroes get a SOS signal from the planet Shelezyaka, a planet that is populated only by robots, who recently started malfunctioning. It is then revealed that the robots once helped the Chatterbird as well, and also that the Doctor visited the planet as well and found out about this. All the malfunctioning happened shortly after the Doctor left off: as a revenge, he put diamond dust into the grease that the robots used. Exploring the three-planet Medusa system, the heroes pass the inhospitable first planet and find mirage-projecting stones at the second planet, who depict the Blue Seagull — a spaceship of Captains Kim and Buran. On the third planet, however, the heroes experience some adventures with the local flora and fauna, and get some clues that the Blue Seagull can be somewhere there. Later, Alisa finds strange mirror-like flowers. After the heroes transport them to the Pegas, they found out that the flowers had been recording everything that was happening in front of them, and upon being picked up, they started deteriorating and depicting what they recorded in reverse. Watching the flowers, the heroes find out that both Verkhovtsev and Funnyguy Oo were on the planet, and they were cooperating as space pirates. Pretty soon, the tortoise destroys the flowers, and Zelyony finds out that the tortoise actually was a spying device that helped the pirates to track down the heroes. In attempt to fly in a safe place, Pegas falls in a trap. Seleznyov and Zelyony are captured by Verkhovtsev and Funnyguy Oo, while Alisa manages to escape. She then finds out that Captain Buran also landed on the planet — together with Doctor Verkhovtsev, but, apparently, not the same one who trapped her comrades. The Blue Seagull appears to have been caught in the same trap that Pegas landed in. It is then revealed that Captain Kim was trapped in his spaceship by pirates, who wanted to get his formula of absolute fuel. However, after the pirates took heroes as hostages and threaten to murder them, Kim, not having the strength to hold in anymore, exits the ship, encounters and disarms the pirates on his own. Pretty soon, Buran and the other Doctor Verkhovtsev arrive and help him, and the pirates get clearly outmatched. With two Verkhovtsevs being at the same place now, one of them exposes the other one as Glot the space pirate (who immediately attempts suicide, but is exposed by Funnyguy Oo just to be feigning death), reveals that Glot posing as him was the one responsible for all the crimes, and confesses that Glot and Funnyguy Oo's previous interest in the Captains' diaries made him suspect the heroes back at the museum. Buran also points out that the Chatterbird's previous owner, knowing the bird's lines about the Medusa system, was the one who directed him and the real Verkhovtsev there. After everything is settled down, the heroes make Funnyguy Oo open the trap and capture him and Glot. With the commotion around Gromozeka suddenly appearing late to the call to save the day, Funnyguy escapes, but is captured by a local bird of prey and carried away to the nest. In the end, the captains and the Doctor take away from the planet, and the main protagonists are returning to Earth with captured Glot and with the animals they collected. ==Cast==