When notorious Louie the Lug hides aboard a space ship bound for the moon, Astro Boy leaps aboard just before blast-off. Suddenly, a meteor hits the ship and in the scramble to escape, Astro Boy finds that his lifeboat companions are Louie and a group of strange, hostile characters. An emergency landing is made upon an asteroid. Here, Astro Boy discovers an ancient ruined space shipwreck-the remains of an expedition headed by woman astronaut Margo Polo. Margo had discovered diamonds upon the asteroid. When Louie the Lug and others in Astro Boy’s party learn of the diamonds, they fall to fighting among themselves over the riches. ln a surprise but true-to-Iife turnabout, some ”nice guys" in the party become villains, and the greatest villain of all, Louie, becomes a "nice guy” and a hero!