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

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.

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.

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 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.