Legion of Super-Heroes in the 31st Century #20

Legion of Super-Heroes in the 31st Century — DC Comics

Issue: #20

Metallo journeys to the future for the ultimate power source: Kryptonite! But if he destroys Superman, will the Legion's fate unravel, as well? Don't miss the exciting conclusion to this amazing series!

First appearances: Superman-X

Creators: Harvey Richards, Heroic Age, Philip Moy, John Stanisci, Jack Briglio, Sal Cipriano, Sanford Greene

Characters: Superman, Bouncing Boy, Brainiac 5, Chameleon Boy, Colossal Boy, Cosmic Boy, Dream Girl, Lightning Lad, Timber Wolf, Superman-X, Sun Boy, Saturn Girl, Ultra Boy, Duplicate Girl, Phantom Girl, Shrinking Violet, Tyroc, Matter-Eater Lad, Tharok, Metallo