[1] The story arc features the efforts of the Legion of Super-Heroes to halt a massive intergalactic war involving the United Planets, the Khunds, the Dominators, the Dark Circle and the sorcerer Mordru.
The Legionnaires prevent a pair of assassins from killing the Dominion diplomatic delegation at Weber's World, but it is only one in a series of events seemingly designed to disrupt the peace conference.
As the Khunds approach Legion Headquarters, the only ones remaining to defend the complex are the four Legionnaires who were forced to retire upon marriage: Lightning Lad, Saturn Girl, Bouncing Boy and Duo Damsel.
[2][3] After the four of them successfully defend Legion HQ, Saturn Girl telepathically probes one of the Khundish commanders, learning that reinforcements sent by the Dark Circle are approaching the planet.
Only a handful of Legionnaires are conscious when one of the Circle agents (who had been masquerading as Ambassador Relnic) reveals himself to be the escaped foe that Erin tried to warn the Legion about earlier: the sorcerer Mordru.
In orbit above Earth, Mordru fends off the entire group of heroes, until Element Lad is able to transmute the free-floating hydrogen atoms surrounding the sorcerer into soil.