“FOLLOW THE LEADER!” The Legion is one big, happy team, right? Guess again! As divisions begin to take root over who’s really in charge, the team learns another chilling secret about the United Planets—a secret that may remove a key Legionnaire from the playing field!

Brainiac 5, Chameleon, Saturn Girl and Light Lass go to Brainy's world of Colu to find it in shambles. Every denizen of that planet have lost their intelligence, their very identity, and it was all due to Praetor Lemnos. They capture Lemnos, but he is able to escape. However, they can remember this incident which is remarkable since he can make others forget.

Meanwhile, Cosmic Boy breaks into Brainiac 5's lab to learn his secrets.