| Issue | #521 |
| Published | July 1981 |
| Cover Price | 0.50 |
| Pages | 36 |
| Editing | Julius Schwartz |
| Characters | Superman; The Vixen; Atom (inset); Aquaman (inset) |
| Genre | Super-hero |
| Pencils | Ross Andru |
| Inks | Dick Giordano |
| Characters | Superman; Clark Kent; Lana Lang; Morgan Edge; The Vixen (intro, guest star); Mule (villain) |
| Genre | superhero |
| Script | Gerry Conway |
| Pencils | Curt Swan |
| Inks | Frank Chiaramonte |
| Colors | Gene D'Angelo |
| Letters | John Costanza |
| Notes | The Vixen is credited on the splash page as created by Gerry Conway. |
| Characters | Aquaman; The Atom [Ray Palmer]; an aquatic blob (villain) |
| Genre | Super-hero |
| Script | Bob Rozakis |
| Pencils | Alex Saviuk |
| Inks | Vince Colletta |
| Colors | Jerry Serpe |
| Letters | John Costanza |
| Notes | Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. |