The UN decides to launch two rocket ships, called SPIPs, to the Moon on a reconnaissance mission. En route, both ships are attacked by remotely controlled meteors called 'space torpedoes'. Iwamura, the navigator of SPIP-1, is also under mind control by the aliens. He is caught trying to disable the rocket's weapons and is tied up. Both SPIPs avoid the meteors and are given a warning by the Natal not to land on the Moon, but it is ignored. Once the rockets land on the Moon, the two teams look for the alien base in lunar rovers. Meanwhile, Iwamura has untied himself and blown up SPIP-1. They find a cave on foot and locate the Natal base in a deep crater. Etsuko is temporarily captured by the Natal but is rescued by Katsumiya. A beam weapon battle erupts as the teams attack the base. The Natal base is destroyed, freeing Iwamura from the aliens' mind control. Feeling guilty, Iwamura stays behind to give covering fire, allowing the SPIP-2 to escape.