| Issue | #31 |
| Published | December 1940 |
| Cover Price | 0.10 |
| Pages | 68 |
| Editing | Whitney Ellsworth, Murray Boltinoff |
| Notes | Superman has blue "S" on cape. Inker revision from Wayne Boring to Leo Nowak by Bob Hughes 8-24-08. |
| Characters | Superman |
| Genre | superhero |
| Pencils | Joe Shuster |
| Inks | Leo Nowak |
| Letters | typeset |
| Notes | Superman has blue "S" on cape. Inker revision from Wayne Boring to Leo Nowak by Bob Hughes 8-24-08. |
| Reprinted | In Superman: The Action Comics Archives (DC, 1997 series) #2 (1998). |
| Characters | Superman [Clark Kent]; Lois Lane; Villains: Baron Munsdorf (I), Kolb [D], un-named henchman [D]; Professor Hunter. |
| Synopsis | Lois is taking a vacation to Brentville, but she and Clark are amazed to see the residents fast asleep, victims of a kindly professor's new "gas" invention. But Superman must stop Baron Munsdorf, who wants the plans for that gas, and other inventions of the professor, including the deadly sub-atomic death ray! |
| Genre | superhero |
| Script | Jerry Siegel (signed) |
| Pencils | Jack Burnley (signed as Joe Shuster) |
| Inks | Jack Burnley (signed as Joe Shuster) |
| Notes | Modified synopsis added by Craig Delich 8-24-08. |
| Reprinted | In Superman: The Action Comics Archives (DC, 1997 series) #2 (1998). |
| Characters | Pep Morgan |
| Genre | adventure |
| Pencils | George Papp |
| Inks | George Papp |
| Genre | gag |
| Characters | The Black Pirate [Jon Valor] |
| Genre | period |
| Pencils | Sheldon Moldoff (signed) |
| Inks | Sheldon Moldoff (signed) |
| Genre | fact |
| Script | George Papp |
| Pencils | George Papp |
| Inks | George Papp |
| Notes | Writer credit added by Craig Delich 8-24-08. |
| Characters | Three Aces: Fog Fortune, Gunner Bill & Whistler Will. |
| Genre | adventure |
| Script | Gardner F. Fox |
| Pencils | Chad Grothkopf |
| Inks | Chad Grothkopf |
| Notes | Writer credit added by Craig Delich 8-23-08. |
| Characters | Danny Dubb |
| Genre | gag |
| Pencils | Stan Aschmeier |
| Inks | Stan Aschmeier |
| Characters | Tex Thomson |
| Genre | adventure |
| Script | Ken Fitch? |
| Pencils | Bernard Baily (signed) |
| Inks | Bernard Baily (signed) |
| Letters | Bernard Baily |
| Notes | Letterer credit added by Craig Delich 8-23-08. |
| Genre | adventure |
| Script | Ivan Dmytryk (signed) |
| Pencils | ? (spot illos) |
| Inks | ? (spot illos) |
| Letters | typeset |
| Characters | Clip Carson |
| Genre | adventure |
| Pencils | George Papp |
| Inks | George Papp |
| Genre | fact |
| Characters | Zatara |
| Genre | occult |
| Script | Gardner F. Fox |
| Pencils | Joseph Sulman |
| Inks | Joseph Sulman |