Warning from Space or Mysterious Satellite (Spacemen Appear in Tokyo) is a 1956 science fiction tokusatsu film produced by Daiei, and the first Japanese science-fiction film produced in color. “Planet ‘R’” is on a collision course with Earth. Warning from Space has one-eyed, starfish-shaped aliens from the planet Paira who take on human forms to warn the earth about the impending disaster. In contrast to the usual anti-nuclear message of the Japanese science-fiction film genre, Warning from Space seemingly takes the position that nuclear weapons can be put to good use, as a means to prevent the collision with Planet ‘R. wiki

Ahh, yes. Special effects and staging which surpasses even the Radar Men from the Moon series!