A spaceship is on a free search in space. On one of the planets of the galaxy astronauts find a starship, probably belonged to an ancient civilization. People want to understand the reasons for the disaster and find out who the starship belonged to. Everything seems very strange and dangerous – and the planet on which the astronauts land, and the discovered starship, which looks like a pyramid. In addition, it turns out that on the planet there is a hostile fauna – terrible monsters. One of the monsters penetrates the spaceship and becomes an eternal nightmare and a source of danger for the entire crew of the starship.