The concluding half of the Edmond Hamilton/Curt Swan prison story in Adventure 345 (June 66) ups the drama, as we discover a spy in the barracks, and Matter-Eater Lad faces a firing squad.
As Nardo always seems to know the escape plans the boys are forming, Brainiac 5 realizes there must be a spy among them. He builds a little flying “bug” and discovers that Weight Wizard is the traitor. Confronted by the other prisoners, he flees, but his escape costs him his life.
Nardo proves ever more sinister as the story progresses. Invisible Kid’s failed escape attempt results in Nardo shrinking him and leaving him to some nasty insects, though Lyle Norg is resourceful enough to survive.
It’s the female Legionnaires who save the day, really. Saturn Girl mentally contacts Brainiac 5, alerting him to their plans. Light Lass uses her powers to weaken a gate, and Duo Damsel breaks it down, while her other body distracts the guards. They free the boys, and Superboy, Mon-El and Ultra Boy swoop in to the rescue.
Matter-Eater Lad’s execution is deflected by Superboy, as shown on the cover, but the ray gun still has an effect, enlarging him to Bouncing Boy size.
Shadow Kid has little to do in this story, but will return over the years.
This also marks the final Edmond Hamilton Legion tale, and possibly his final comic book story, as he retired at this point.