On the planet, Yanin becomes a victim of vampires, but his American colleagues (bearing obvious similarity to Schwarzenegger and Stallone) help him. They propose to play a plan developed by them - to lure vampires with a signal and shoot them. Yanin gives the right to conduct an experiment on the minimum signal power, together the cosmonauts fight vampires, but later Yanin decides to look for another way and goes to the reconnaissance. On the way, vampires attack him again, but he manages to recover from the disease they carry because of prolonged exposure to air. He meets representatives of a rational race, and they explain to him that vampires produce food for them and are an important part of the ecosystem.
