Four astronauts fly to the moon for a rescue mission to find out the fate of two of their colleagues from NASA, who have not been in touch for several days. The creatures they found on the lunar base are not who they claim to be. These creatures almost managed to kill our heroes as a result of cunning and deception, but as a result they themselves died. The Quartet returns to Earth and learns that every person on the planet has been transformed into a different version of the form of life. Aliens from Mars have conquered the Earth and are now seeking to destroy the last remnants of humanity. The astronauts are repelling the invaders and will soon learn how to get rid of the alien threat.