The Legion hunt down a space dragon whose radioactive scales help the people of Imsk maintain their shrinking powers. When too many scales are removed at once, the dragon explodes and merges Shrinking Violet, Colossal Boy, Lightning Lad and Saturn Girl into a berserk composite Legionnaire.

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

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!

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 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.

The Legion travels back in time to Krypton on the day of its destruction in order to save the citizens of 30th Century Tokyo.

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!