The Legion must turn to help from their greatest foes when they are unable to stop the Sun-Eater themselves. Meanwhile, Superman confronts the Sun-Eater's controller but even he may be powerless before the alien.

The Legion faces off against Imperiex and his new ally Lightning Lord.

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.

When the Legion are tied up fighting a horde of creatures consuming the Earth's ionosphere, the rejects from the yearly Legion Auditions are the only ones standing between Earth and total destruction.

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.

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.

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.

It is the 31st century. A group of super heroes called the Legion of Super Heroes travel back in time to recruit earth's greatest super hero, Superman, to help fight the evil of their time. While their intentions were good, good intentions don't always produce good results. Instead of bringing back Superman, they retrieve a young Clark Kent from his farm in Smallville to the future.

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.

Lightning Lad resigns from the Legion to join a new team, but soon finds himself caught in a conflict of interest when the two teams end up opposing each other.

Brainiac 5 is forced to get ahead to lead two of his teammates to a planet where the only cure for his faltering IQ can be found.

A Legion team is forced to take refuge in a derelict space station but are separated and begin disappearing one by one.

A scientist asks the Legion to help him capture what he claims is a dangerous creature, but both the creature and the scientist have a dark secret.

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.

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.

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.