Scrooge is aboard a space ship with his nephews and Gyro. They have already hauled an appropriate asteroid into Jupiter’s orbit and are about to hollow out the asteroid so that it can serve as a new money bin for Scrooge. Suddenly peaceful little extra-terrestrials appear. The Astromites, who live as space nomads, manage to talk Scrooge into allowing them to settle on the astoroid when they in turn guard the money inside. When Donald abuses the board computer for his tax data a catastrophe ensues, but thanks to the Astromites everything ends well.