A group of starfish like aliens from the planet Pyra¸ which is on the same orbital plane as Earth but on the opposite side of the sun come to Earth to warn mankind about a runaway planetoid known as Planet R that is on a collision course with Earth. It is feared that when Earth is destroyed that their planet will be destroyed as well. However¸ their form causes people to panic¸ so they chose a female member of their race to take human form to spread their message. They then decide to contact a prominent scientist who has invented a new source of energy that can also be made into the most destructive bomb the world has known to destroy the planetoid. Unfortunately¸ the scientist is kidnapped by enemy agents who want to use the bomb for their own purposes. Now it becomes a race against time to find the scientist so he can complete his formula and save mankind.