| Issue | #21 |
| Published | March-April 1943 |
| Cover Price | 0.10 |
| Pages | 68 |
| Editing | Whitney Ellsworth (credited), Jack Schiff (actual) |
| Notes | Cover art confirmed by Burnley. |
| Characters | Superman |
| Genre | superhero |
| Pencils | Jack Burnley |
| Inks | Jack Burnley |
| Letters | typeset |
| Reprinted | in Superman Archives (DC, 1989 series) #6 (2003) |
| Characters | Superman [Clark Kent]; Perry White; Sgt. Casey; Frank Lingle; Carlton Graul (villain; intro) |
| Synopsis | Clark Kent is the only reporter invited to the testing of a cannon made of the new X-Alloy, but when it explodes, it leads Superman to the Lingle Steel Corporation, manufacturer the alloy, only to discover the plant honeycombed with spies. |
| Genre | superhero |
| Script | Jerry Siegel (signed) |
| Pencils | Ed Dobrotka [as Joe Shuster] (signed) |
| Inks | John Sikela [as Joe Shuster] (signed) |
| Reprinted | in Superman Archives (DC, 1989 series) #6 (2003) |
| Characters | Victor |
| Genre | children |
| Notes | This filler was NOT reprinted in the Archive. |
| Genre | humor |
| Script | Henry Boltinoff (signed) |
| Pencils | Henry Boltinoff (signed) |
| Inks | Henry Boltinoff (signed) |
| Letters | Henry Boltinoff |
| Notes | This filler was NOT reprinted in the Archive. |
| Characters | Superman [Clark Kent]; Perry White; Lois Lane; Sgt. Casey; Cordell (villain; intro); Graney (villain; intro; dies); Graham (villain; intro); Kingsley (villain; intro; dies); Charles Clayton (villain; intro) |
| Synopsis | After a run-in with four notorious underworld gang leaders (one of them being killed in the process), Lois decides to write a series of articles exposing them and to begin a crusade against them by implying there is a gang war in progress, and one of the three remaining leaders is trying to wipe out his rival. |
| Genre | superhero |
| Script | Jerry Siegel (signed) |
| Pencils | Leo Nowak [as Joe Shuster] (signed) |
| Inks | Leo Nowak [as Joe Shuster] (signed) |
| Reprinted | in Superman Archives (DC, 1989 series) #6 (2003) |
| Characters | Snapper |
| Genre | humor |
| Script | Whitney Ellsworth? |
| Pencils | Whitney Ellsworth? |
| Inks | Whitney Ellsworth? |
| Notes | This filler does NOT appear in the Archives. |
| Characters | Superman [Clark Kent]; Lois Lane; Perry White; Sgt. Casey; Mr. Phelps; Lucy Trent; Sir Gauntlet [Caspar Smythe](villain; intro) |
| Synopsis | When Lois Lane is arrested for wearing a stolen mink coat from Lacey's Department Store, Clark Kent learns that a former employee from Lacey's sold it to her, even though she said she didn't steal it herself. The Man of Tomorrow, upon further investigation, believes that that employee, Lucy Trent, is shielding someone, as other items are also being reported as missing from the store. |
| Genre | superhero |
| Script | Jerry Siegel (signed) |
| Pencils | Joe Shuster (signed) |
| Inks | George Roussos [as Joe Shuster] (signed) |
| Notes | Superman's mountain retreat (or Fortress) appears in this story. |
| Reprinted | in Superman Archives (DC, 1989 series) #6 (2003) |
| Genre | adventure |
| Script | Wally Walker (signed) |
| Letters | typeset |
| Notes | This text story does NOT appear in the Archive. |
| Characters | Superman [Clark Kent]; Lois Lane; Sam Jackson (dies); Manley; Blinky Moxby (villain; intro); Knuckles (villain); Mike Chandler (villain); Luthor (villain; cameo); Ultra (villain; cameo); The Puzzler (villain; cameo); Metalo (villain; cameo); The Prankster (villain; cameo); Adolf Hitler (villain; cameo); Hideki Tojo (villain; cameo) |
| Synopsis | The murder of Sam Jackson, a man involved in a street grafting operation, is blamed on a city commissioner, who informs Police that Mike Chandler did it, and his only witness to that event is another criminal, "Blinky" Moxby. Superman goes to great lengths to find Moxby and get proof of the commissioner's innocence, including allowing Moxby to think he has actually killed the Man of Steel! |
| Genre | superhero |
| Script | Jerry Siegel (signed) |
| Pencils | Peter Riss [as Joe Shuster] (signed) |
| Inks | Peter Riss [as Joe Shuster] (signed) |
| Reprinted | in Superman Archives (DC, 1989 series) #6 (2003) |