Arthur Blacke is not enjoying his new status as hero of the universe after saving a star liner full of hostages from the space pirates, so he decides to take a vacation from his job as custodian at a Texas bar on an alien space station. He is going back to Earth to visit his mother.
On Earth, he finds out that the very company that owned the space liner had been the one that hired the pirates, and the owner of the corporation had been trying to sell human beings to two alien partners. San Francisco is in danger of being destroyed, and all Arthur has to do to save it is learn how to fly an alien ship, defeat the mercenaries working for the company, beat their leader in unarmed combat, save the U. S. President and a few hundred other hostages, and then outwit a twisted business executive and his two alien cronies. Sounds easy enough, right?