Kharlak the Khund returns to challenge a Legion team who are investigating a murder on a mining asteroid.
The Legion of Super-Heroes are called in to solve a murder mystery that occurred on one of the fringe planets of the United Planets, in a mining town. Meanwhile, Duplicate Boy confronts Colossal Boy and Shrinking Violet about their affair, since Shrinking Violet is supposed to be Duplicate Boy's girlfriend. The Legion are called in to handle the dispute this causes, as a giant Duplicate Boy tangles with Colossal Boy. The whole ordeal leaves Element Lad and Officer Shvaughn Erin to question things about Shrinking Violet. Meanwhile, Kharlak the Conqueror is revealed to be the culprit behind the mine town murder and the Legion fight him.