The Legion battles the force behind the Dark Circle's plan to conqueror the Earth! If they fail, the Earth and the entire galaxy will fall to the power of the mad magician Mordru!

Tharok plans to remake Corvan IV the way the Fatal Five wants it, but the Legion steps in.

The Legion discovers that the president of Earth has been siphoning funds from R.J. Brande to rebuild the planet, just before the super-team is attacked by a villain called the Psycho-Warrior.

Ambassador Relnic and the Dominators vanish during peace talks on Weber's World and the Khunds invade Earth with only the Legion of Substitute Heroes as a last defense!

During the Khunds' invasion of Earth, former Legionnaires Lightning Lad, Saturn Girl, Bouncing Boy, and Duo Damsel return to defend the Legion armory! Plus, the Legion discovers who really started the war!

Newlyweds Lightning Lad and Saturn Girl retire from the team, but Arma Getten kidnaps R.J. Brande and sends the Legion to retrieve three items as a ransom!

The Legion tries to halt the Khunds' invasion of Earth. Plus, a group of thieves plans to execute three heists from a flying restaurant—where four Legionnaires just so happen to be taking the night off from super hero work!