This little 11-page gem uses a clever device to show us something that, until now, readers did not know existed—the Legion Academy. Possibly it was just established as the new HQ allowed the space for it. As I recall, Paul Levitz, about 20 years later, would establish that the Academy was an initiative begun by Invisible Kid when he was leader.
Colossal Boy, with an evening free, goes to have dinner with his parents. Before they can sit down to a meal, however, a galactic TV crew (?) shows up at the door, asking to interview the family. Kind of an odd “surprise” interview, but the Allons, surprisingly star-struck by a TV camera, decide to go for it. And it’s fake, and Mom and Dad get turned to glass. They’re still alive as Mrs. Allon’s glowing life gem proves. Unless Colossal Boy turns over the secrets of the Legion Academy, his parents will be smashed to fragments. And returned to him, of course. It would be dishonest to keep the fragments. That would be theft.
CB explains that full members have no clue what happens in the Academy. That’s closely held information. So he can only get in there if he screws up and gets ordered to re-training, which he’s willing to do. And he does, carefully planning a “mistake” that doesn’t directly threaten lives.