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.

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.

Superman makes a new friend, Alexis, but his new chum soon becomes obsessive about having Superman as her only friend and not sharing him with anyone else...including the Legion.

Superman accidentally opens a portal to a phantom dimension, unleashing a teenager with powers that match his own who eventually traps the other Legionnaires there.

Lightning Lad enters the Intergalactic Games and must compete against his greatest rival.

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

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.

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.

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 a young sorcerer comes to Earth and wreaks havoc, particularly on a magic-vulnerable Superman, Phantom Girl must try to convince his elders to reign him in.

At a moment of crisis, Cosmic Boy returns to lead the Legion, accompanied by a mysterious new hero.

The ancient organic weapon known as the Sun-Eater has been unleashed, and it lives up to its name. It heads toward Earth's sun and not even the Legion can stop it.

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.

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.