Astronomers discover an extraterrestrial satellite orbiting in space, pounding Earth's surface with thousands of meteorites. The meteors turn out to be flying saucers, transporting bizarre alien creatuers who carry with them a desperate message for the world's leaders. The visitors announce that a runaway planet on a collision course with Earth is certain to destroy the planet, but the aliens have a plan. As tidal waves engulf cities and chaos rules the streets, human scientists combine their technology with the alien brainpower to save the Earth and restore peace.

This ingenous science fiction thriller was originally released in Japan with the title Uchujin Tokyo Ni Awaru (Unknown Satellite Over Tokyo)