Scientists astronauts return to Earth after a successful mission to Mars. However, a terrible thing that threatens the life of earthlings enters the ship with different samples. One of the participants of the flight turns into an unearthly creature and craves to give birth to his kin. He needs to meet with other individuals that are studied in the laboratory. This should not happen. Excellent special effects give a sense of reality and impress imagination. Upscale work is done by the same team of artists that made the first film.