Superman Supacomic #121

When Superboy Walked Out on the Legion! finds the young hero among a galaxy-spanning contest for rulership on the planet Thrann, where champions from across the cosmos must prove their worth. As alliances shift and rivalries flare, Superboy faces a test not just of strength, but of loyalty—especially when the men of Thrann begin to question the very nature of power they’ve long upheld.

In "The Colossal Failure!", Colossal Boy’s loyalty is tested when he’s blackmailed into betraying the secrets of the Legion Academy. When his deception is exposed, he’s expelled from the ranks of the Legion of Super-Heroes, leaving his teammates—Ultra Boy, Superboy, Bouncing Boy, Saturn Girl, Shrinking Violet, and Brainiac 5—facing a crisis of trust. With the Chemical King and the mysterious Pollor stirring trouble, and the enigmatic Gorko watching from the shadows, the young heroes must navigate the fallout of one of their own’s downfall.