| Issue | #321 |
| Published | February 1965 |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Mort Weisinger |
| Characters | Superman |
| Genre | superhero |
| Pencils | Curt Swan |
| Inks | George Klein |
| Characters | Superman; The Four Intergalactic Thiefmasters (villains); The Thorones (intro, villains); Lois Lane; Jimmy Olsen |
| Genre | superhero |
| Script | Edmond Hamilton |
| Pencils | Curt Swan |
| Inks | George Klein |
| Notes | Introduces the Thorones, an alien race that is super-powered under suns of any color. |
| Characters | Supergirl; Fred Danvers; Edna Danvers; Red Kryptonite; Green Kryptonite; Fortress of Solitude; Phantom Zone; Kandor; Comet the Super-Horse; Debbie Porter (villain); Superman Museum |
| Genre | superhero |
| Script | Leo Dorfman |
| Pencils | Jim Mooney |
| Inks | Jim Mooney |
| Reprinted | in Showcase Presents: Supergirl (DC, 2007 series) #2 |
| Genre | superhero |
| Letters | typeset |
| Notes | Summarizes Superman stories from Superman #155, World's Finest Comics #114, Action Comics #266, Action Comics #263-264, and Superboy #88. |