Natarls

The Natarl race first appeared in Battle in Outer Space, the 1959 sequel to The Mysterians. This film itself takes place in 1965, several years after the formation of the Earth Defence Force, of which Etsuko Shiraishi and Professor Tanjiro Adachi are now members.

The aliens display a wide array of technology and and ingenuity in their attempt to overthrow the earth by various means, including mind control, sabotage, anti-gravity rays, space-torpedoes, saucer attacks, and finally their huge mothership.

The Natarls are eventually defeated through the cooperation of earth's nations in developing new weapons, launching a fleet of advanced rocket ships, and a sneak-attack on the aliens moon base.