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The series centers on a young Superman's adventures in the 31st century, fighting alongside a group of futuristic superheroes known as the Legion of Super-Heroes.
A 41st century Superman clone, Kell-El, travels to the Legion's time and needs the group's help against the intergalactic menace of Imperiex.
Imperiex begins his conquest of the 31st century by freeing the Legion's greatest enemies from prison. The team must look to Superman in the 21st century for help, and Superman comes to the future only to meet his 41st century clone, Kell-El.
When it appears that Timber Wolf viciously attacked his own father, the Legon try to bring him in... while Chameleon Boy and Phantom Girl work to clear his name.
The Legion faces off against Imperiex and his new ally Lightning Lord.
When only one applicant makes it through the Legion testing, Superman decides to recruit a new member: the non-powered master of martial arts, Karate Kid.
Chameleon Boy infiltrates Imperiex's ranks as Persuader. But something goes horribly wrong.
A time-traveling bounty hunter from the future sets his sights on a small boy. The Legion goes up against him and discovers an unlikely ally.
On a mission to the last surviving outpost of Krypton, Superman learns how Brainiac 5's ancestor was the one who participated in the destruction of his homeworld.
While on a mission to rescue the Legion¹s benefactor, R.J. Brande, the heroes find themselves reminiscing about how the Legion was first created by Brande and its founding members: Cosmic Boy, Lightning Lad, and Saturn Girl.
The Legion's old nemesis Zyx comes to them from aid when the evil sorcerer Mordru takes over his homeworld of Zarok.
The Legion battle the Dark Circle with the aid of Dream Girl, who can predict the enemy's every move before they make it. But when the Dark Circle realize how the Legion is defeating them, they abduct Dream Girl and put her abilities to use themselves.
The Legion must face Imperiex in final battle... while a traitor lurks in their midst.
After eliminating Imperiex, Brainiac 5 takes over his army and plans to conquer the universe. With Superman presumed dead, the other Legionnaires must stop him before it is too late.
