When fearsome villains the fatal five set their sights on the newly formed Legion of Super Heroes, three of the Legion's members go back in time to get help from the greatest hero of all time: Superman. Instead they find Clark Kent, aware of his powers but not yet of his grand destiny.
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A mysterious scientist asks the Legion to help capture a dangerous creature. They succeed, only to discover the creature is nowhere near as dangerous as the scientist himself.
Superman unknowingly saves the life of Alexis, one of the wealthiest people in the galaxy. Alexis and Superman become fast friends, but when Superman's Legion responsibilities get in the way of their friendship, Alexis decides to do something about it…
During a cosmic storm, the team takes refuge in a creepy, derelict space station. On board, one-by-one, each Legionnaire faces his or her deepest fear - and then disappears.
While supporting Lighting Lad as he competes in the challenging Galactic Games, Superman and Phantom Girl uncover a sinister plot by the Fatal Five! Lightning Lad has troubles of his own when he finds his biggest competition from someone close to him.
When Superman accidentally opens a gateway to a phantom dimension, a young man with powers identical to his is freed in the process. Now Superman must not only stop this destructive visitor, but also rescue the Legionnaires when they become trapped in the visitor’s dimension.
A young sorcerer arrives on Earth and causes a heap of trouble. In an effort to send him home, Superman learns of his vulnerability to magic, while Phantom Girl puts her diplomatic skills to the test as she travels to the sorcerer's secretive world to ask for help.
Much to the Legion's disappointment, Lighting Lad accepts an invitation to join an older, "cooler" team. Once there, however, Lightning Lad realizes these new heroes aren't exactly what they seem. Now, caught between the Legion and his new friends, Lighting Lad must decide once and for all where his loyalties lie.
A major malfunction sends Brainiac 5's genius IQ plummeting. To obtain the rare element needed to save him, Superman and Timber Wolf must travel to the most inhospitable planet in the galaxy - and thanks to a transporter accident, they have only Brainy's head to guide them.
It's that time of year again - Legion Auditions! This year's crop is hardly promising, with most hopefuls turning out to be comic duds. But when the Legion is overwhelmed fighting a mysterious foe in Earth's upper atmosphere, a group of rejects takes it upon themselves to save the world below...with outrageous results.
When disaster strikes Lightning Lad's home planet of Winath, the Legion is called to help. Lightning Lad's efforts to take charge are thwarted however when long-absent Legion leader Cosmic Boy arrives with an enigmatic new hero in tow.
The Legion is put to the ultimate test when an ancient weapon known as a Sun Eater comes to life. The Legion mounts a heroic defense, but the Sun Eater proves too powerful. Now at full strength, the unstoppable Sun Eater sets its sights on Earth...
With the Sun Eater on a direct course for Earth's sun, the Legion has no choice but to ask bitter enemies for help to stop it. Superman meanwhile has his toughest battle yet when he discovers the stealthy alien controlling the sinister machine. In the end, the Legion triumphs...but at a terrible cost.