| Issue | #21 |
| Published | June-July 1947 |
| Cover Price | 0.15 |
| Pages | 76 |
| Editing | Sheldon Mayer (editor) , Julius Schwartz, Robert Kanigher (story editors) |
| Characters | Green Lantern; Flash; Wonder Woman. |
| Genre | superhero |
| Pencils | Everett E. Hibbard |
| Inks | Everett E. Hibbard |
| Characters | Wonder Woman [Diana Prince]; Mala; Gerta von Gunther; Hippolyte; the Amazons; Paula von Gunther; Queen Sharkeetah (villain). |
| Synopsis | Wonder Woman must battle an evil group of mermaids that were created from tiny sharks by a formula invented by Gerta, willful daughter of Paula von Gunther. |
| Genre | superhero |
| Script | William Moulton Marston (signed as Charles Moulton) |
| Pencils | Harry G. Peter (signed as H. G. Peter) |
| Inks | Harry G. Peter (signed as H. G. Peter) |
| Notes | Much info and synopsis added by Craig Delich 9-5-09. |
| Characters | Mutt; Jeff. |
| Genre | humor |
| Script | Al Smith (signed as Bud Fisher) |
| Pencils | Al Smith (signed as Bud Fisher) |
| Inks | Al Smith (signed as Bud Fisher) |
| Letters | Al Smith |
| Notes | Newspaper reprints. Letterer credit added by Craig Delich 9-5-09. Changes to sequencing by Len Wolinsky, 3/15/2006. |
| Characters | Percival Drizzle |
| Genre | adventure |
| Script | Howard Purcell |
| Pencils | Howard Purcell |
| Inks | Howard Purcell |
| Notes | Changes to sequencing by Len Wolinsky, 3/15/2006. |
| Characters | Mutt; Jeff. |
| Genre | humor |
| Script | Al Smith (signed as Bud Fisher) |
| Pencils | Al Smith (signed as Bud Fisher) |
| Inks | Al Smith (signed as Bud Fisher) |
| Letters | Al Smith |
| Notes | Newspaper reprints. Letterer credit added by Craig Delich 9-5-09. Changes to sequencing by Len Wolinsky, 3/15/2006. |
| Characters | The Flash [Jay Garrick]; Joan Williams; Ken Kummer. |
| Synopsis | The son of a successful newspaperman takes on the challenge of a dangerous assignment in order to prove to his fiancee that he can make it on his own as a reporter, and not let his dad support him for the rest of his life. But, in the end, even he must accept the help of the Flash or risk having his first story being his last! |
| Genre | superhero |
| Script | Robert Kanigher? |
| Pencils | Martin Naydel |
| Inks | Martin Naydel |
| Notes | Writer credit revision by Craig Delich, updated 8/04, previously listed as Gardner F.Fox. Changes to sequencing by Len Wolinsky, 3/15/2006. Some info and synopsis added by Craig Delich 9-5-09. |
| Characters | Hop Harrigan; Doc Groan; Miss Snap. |
| Genre | aviation |
| Script | Jon L. Blummer (signed) |
| Pencils | Jon L. Blummer (signed) |
| Inks | Jon L. Blummer (signed) |
| Letters | Jon L. Blummer |
| Notes | Changes to sequencing by Len Wolinsky, 3/15/2006. |
| Characters | John O'Malley |
| Genre | detective |
| Script | Irwin Hasen |
| Pencils | Irwin Hasen |
| Inks | Irwin Hasen |
| Notes | Credits by Craig Delich, updated 8/04. Writer credit revised from ? to Hasen by Craig Delich 9-5-09. Changes to sequencing by Len Wolinsky, 3/15/2006. |
| Genre | adventure |
| Script | Cliff Rhodes (signed) |
| Letters | typeset |
| Notes | Changes to sequencing by Len Wolinsky, 3/15/2006. |
| Characters | Mutt; Jeff. |
| Genre | humor |
| Script | Al Smith (signed as Bud Fisher) |
| Pencils | Al Smith (signed as Bud Fisher) |
| Inks | Al Smith (signed as Bud Fisher) |
| Letters | Al Smith |
| Notes | Newspaper reprints. Letterer credit added by Craig Delich 9-5-09. Changes to sequencing by Len Wolinsky, 3/15/2006. |
| Characters | Green Lantern [Alan Scott]; Doiby Dickles; Ira Selby. |
| Synopsis | Alan Scott is summoned to his old Alma Mater in an attempt to locate the "brain child" of the university who mysteriously disappeared. |
| Genre | superhero |
| Script | John Broome |
| Pencils | Paul Reinman (signed) |
| Inks | Paul Reinman (signed) |
| Notes | Writer credit by Craig Delich, updated 8/04. Changes to sequencing by Len Wolinsky, 3/15/2006. Alan Scott works for radio station WXYZ in this story. Alan Scott graduated from Hale University. Notes, some info and synopsis added by Craig Delich 9-5-09. |