The planet Darius, which formerly boasted a very advanced civilization, has been destroyed. Proco and Tiat escaped from Darius in search of a new world. They started a new civilization on the planet Olga. The descendants of Proco and Tiat happened to pick strange radio waves being emitted from the Milky way galaxy. The strange radio waves were an SOS from the planet Darius where their ancestors used to live. Having discovered the source of the strange radio waves, the immediately boarded the Silver Hawk, whose power had been greatly increased, and took off for the Milky Way. A fierce battle ensued on the planets of the Milky Way and in outer space in order to save the inhabitants of Darius from destruction.