The Legion Clubhouse #012: Model Citizens

In this episode of The Legion Clubhouse, revenge and murder are high on the to-do list for villains in the adventures of the Legion of Super-Heroes. Also, we see what good teenagers should be doing.

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Adventure Comics #309
The Secret Power of the Mystery Super-Hero
June 1963
w: Edmond Hamilton
a: John Forte
With the other Legion members out on various mission, Saturn Girl, Chameleon Boy, Colossal Boy, Bouncing Boy, Brainiac 5, and Sun-Boy are tasked with selecting a new member into their group. When an applicant named Jungle King, who can control animals with his mind, tries to join the group he is rejected for membership as the animals he control can be easily startled and become a menace.

Angry that he had been rejected, Jungle King uses his powers to gather some of the most dangerous creatures in the universe and forms "The Legion of Super-Monsters" and renaming himself Monster Master for the purpose of terrorizing people and getting revenge against the Legion. His first attempt at revenge, toppling Sky City, is met with failure when the Legion arrives and stops the city from being toppled over, however Monster Master and his Super-Beasts manage to escape.

Tracking Monster Master to the planet Inshar, the Legion battle each of the Super-Beasts, and each are swiftly defeated. Ironically, Monster Master meets his own demise when he rejects a vapor-beast interested in joining his Legion of Super-Monsters. The rejected beast then touches Monster Master, killing him as when such a creature touches it's prey it becomes a lifeless vapor. With the menace of the Monster Master ended, the Legion marvel over the irony of their foes defeat. . -via DC Wikia

Adventure Comics #310
The Return of Lightning Lad!
July 1963
w:Edmond Hamilton
a: John Forte
The Legion of Super-Heroes are assigned to stop a masked criminal who has been terrorizing Metropolis. When the Legion finally confront the Masked Man, they soon realize he can mimic their powers and exhibit many more. During the course of their fight, the Masked Man manages to kill Ultra-Boy.

In subsequent battles, the Masked Man manages to kill all the Legion members until only Superboy remains. Superboy deduces that the Masked Man is Mxyzptlk V, the distant relative of Mister Mxyzptlk, the imp who pesters him in his own time. Using a word reversing device, Superboy manages to trick Mxyzptlk V to say his name backwards, sending him back to the 5th Dimension and reversing all the damage he'd done, including returning the dead Legionnaires to life. . - via DCWikia