A new leader, a new villain, and a story inspired by Agatha Christie’s “And Then There Were None” in Adventure 348 (Sept 66), written by Jim Shooter.
Invisible Kid is elected leader of the Legion, although it’s frankly a bit of a puzzle why. He had not been in a lot of stories, or had very many major roles. One must assume that the Saturn Girl/Brainiac 5 rivalry had worn down the group, and he was seen as a mediator, or peacemaker. Anyway, that’s how I interpret the results. Duo Damsel’s crush on Superboy is also introduced in this sequence.
Once the results are in, the story kicks into action as Sun Boy is knocked unconscious by an earthquake, and wakes with amnesia, running off and hiding. We meet the gold-suited Dr, Regulus, who hates Sun Boy, and attacks the Legion to get at them, stealing their clubhouse and then attacking the members one by one.
He does fairly well with his scheme, taking out Colossal Boy, Duo Damsel, Phantom Girl, Cosmic Boy and Superboy. Invisible Kid fares the best, almost being able to confront him, but even he falls to this new baddie.
Sun Boy regains his memory and has an extended flashback to his origin, just in time to scare off Regulus. Young Dirk Morgna interrupted Regulus, who was a scientist at his father’s laboratory, and Regulus was fired after the resulting explosion. In vengeance, he locked Dirk in an atomic reactor, which endowed him with his powers.
Regulus flees, vowing revenge, and would return many times to face Sun Boy and the Legion.