Superboy & the Legion of Super-Heroes #244

In "The Dark Circle That Crushed Earth," the Legion of Super-Heroes faces a desperate defense of their armory during the Khunds' invasion of Earth, with former members Lightning Lad, Saturn Girl, Bouncing Boy, and Duo Damsel holding the line. As the battle rages, Karate Kid returns from the 20th Century, bringing unexpected aid, while the Legion uncovers the shocking truth: the war was orchestrated by the mysterious Dark Circle, led by the powerful Mordru. Written by Paul Levitz and illustrated by Joe Staton, with inks by Joe Giella, colors by Cory Adams, and letters by Ben Oda, this 1978 issue features a cover by James Sherman and Joe Rubinstein.