| Issue | #312 |
| Published | May 1964 |
| Frequency | monthly |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Mort Weisinger |
| Characters | Superman; Clark Kent [as Metallo]; Green Kryptonite |
| Genre | superhero |
| Pencils | Curt Swan |
| Inks | George Klein |
| Characters | Superman [Clark Kent] (as King Superman and Clark Kent, separated); Lois Lane; Lana Lang; Perry White; Jimmy Olsen; Lori Lemaris; Metallo; Red Kryptonite; Kandor; Fortress of Solitude; Superman Robots; Green Kryptonite |
| Synopsis | Superman, using Red K, splits himself and Clark Kent. Superman becomes a tyrant, and Clark a rebel assasin. But is everything as it seems? |
| Genre | superhero |
| Script | Robert Bernstein |
| Pencils | Curt Swan |
| Inks | George Klein |
| Notes | Character appearances and synopsis from Jason Aydelotte on 11 August 2004. |
| Characters | Supergirl; Lori Lemaris; 'Lady-Killer' Kane; Comet the Super-Horse [Biron]; Green Kryptonite |
| Synopsis | After an alien machine predicts that Supergirl's feats will be affected by "LL"s, Supergirl finds words containing "LL" involved in a series of adventures, for better or for worse. |
| Genre | superhero |
| Pencils | Jim Mooney |
| Inks | Jim Mooney |
| Reprinted | in Showcase Presents: Supergirl (DC, 2007 series) #2 |