Old Roy McIntyre's at it again! The prospector and Burr-O 5000 are on C-40, yet another planet in his never-ending search for the mother lode. Using his high-tech divining rod and his space-pick, he strikes it rich, uncovering a huge deposit of Starstones. But it isn't long before word spans the galaxy and the "gold rush" is on. Beings from all over the universe come to the planet to stake a claim and get rich. Unfortunately, the rush attracts the wrong element as well, like the Black Hole gang, who jump claims and rob the miners of their valuable Starstones. And Capt. Kidd and Squeege, sensing a chance to make a space-buck, naturally show up as well. He's selling blasters and weapons to the bandits who are running roughshod over the planet. This "boomtown", a rapidly grown city which sprang up around the mines is on the verge of being a lawless hell-hole. Which is why they request the Galaxy Rangers to come to town.