Superboy & the Legion of Super-Heroes #246

When a series of mysterious disappearances plague Mercury, the Legion of Super-Heroes—Cosmic Boy, Lightning Lad, Chameleon Boy, Sun Boy, Shadow Lass, and Karate Kid—rally to investigate, only to find their own teammate, Karate Kid, hiding in the medical bay with a secret of his own. With Iris Jacobs [Diamondeth] and Dr. Zebx offering uneasy cooperation, the team must uncover the truth behind the vanishing citizens before Mercury becomes a planet with no one left to close the door.

In "A World for the Winning!", the Legion of Super-Heroes faces a startling twist when the Fatal Five—Mano, Persuader, Validus, Tharok, and Emerald Empress—arrive not as enemies, but as emissaries from Corvan IV. After a brief clash, they reveal they’ve secretly transported the planet’s entire civilization into the future, believing its people are now ready to join the United Planets. Superboy, Colossal Boy, and Element Lad must assess the transformed world, grappling with the question of whether this leap in technology has truly prepared its citizens—or left them dangerously unready.