The story is about earthlings who landed on a planet called the Ark, on which they wanted to settle the inhabitants of the dying planet Panta. However, the Ark planet turned out to be inhabited, moreover, the wreckage of a spaceship of the Free Search Group and an Earthling child raised by non–humanoid aborigines were found on it.
| Directing | Aleksey Fedorchenko | Director |
| Production | Aleksey Fedorchenko | Producer |
| Writing | Aleksey Fedorchenko | Screenplay |
| Writing | Boris Strugatskiy | Book |
| Writing | Arkadiy Strugatskiy | Book |