[1] At the Legion of Super-Heroes' headquarters in the 30th century, Superboy, Duo Damsel, Mon-El and Shadow Lass race toward the Time Chamber, in an effort to escape the sorcerer Mordru, the Dark Lord.
A being of near-limitless mystical power, Mordru conquered much of the galaxy until he was imprisoned in an airless steel block by Superboy and Mon-El.
Duo Damsel and Shadow Lass adopt secret identities which allow them to hide at the homes of Police Chief Douglas Parker and Lana Lang, while Mon-El stays with the Kents in his old guise as Clark's cousin Bob Cobb.
Mordru attempts to flush the Legionnaires out of hiding by creating a myriad of disasters throughout the town, but the teens recognize that the calamities are illusions and ignore them.
After a week passes without Superboy being seen, a group of gangsters tries to seize control of Smallville — but the Legionnaires defeat them in their civilian identities.
Since the wizard is capable of probing their minds, the Legionnaires resume their civilian guises and use a hypnotic device to erase their own memories of their true identities.
Mordru then summons a massive fireball of force in an effort to destroy the Legionnaires once and for all, but the energies cause the cavern to collapse.