Teens in the Universe/Otroki vo vselennoy Eng Sub

The crewmembers of ZARYa starship supposed to mature during 27-year-long flight, appear at the Shedar system after less than one year of local time travel. Remote sensing verifies that one of the planets is very much Earth-like. Three of the crew members should land the new planet. They use the reconnaissance capsule and encounter the apparently abandoned planet. But the "extra" member of the crew Lobanov meets the strange more or less human-like creatures that escort him and his mates to the underground city. They become unreachable for radio communications.

During this link outage orbiting ZARYa rendezvous with another giant spaceship. The commander of that ship explains that their home planet is populated only by the two kinds of bionic robots - executors and far more advanced rulers. These robots were invented two centuries ago, but after some period of good work, rulers tried to improve humans as well as the nature of the planet. Unfortunately, this "improvement" led to the total aloofness of the processed people, including suppression of love and reproductive behaviour. After a century and a half all population of the planet was dead. Only the space radio observatory station crew was unreachable for the robotic "care".

ZARYa crew sets up the second capsule to rescue the crew members captured by robots. Agapit, the son of the station commander, will be their guide in the underground city. After some troubles, boys counterfeit the recharging request from the power plant and burn up all robots at the planet, making it free for the space stationers.