| Issue | #20 |
| Published | April 1963 |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Julius Schwartz |
| Characters | Flash [Barry Allen]; Green Lantern [Hal Jordan] |
| Genre | Superhero |
| Pencils | Gil Kane |
| Inks | Murphy Anderson |
| Notes | Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. |
| Reprinted | in Green Lantern Archives (DC, 1993 series) #3 (April 2001); in Showcase Presents Green Lantern (DC, 2005 series) #2 (February 2007) |
| Characters | Green Lantern [Hal Jordan]; Flash [Barry Allen]; Carol Ferris; Iris West; Henry Fairfax; Mrs. Fairfax; The Bowerds; The Mikrids (villains) |
| Synopsis | Green Lantern and Flash must stop some villains from a subatomic world. |
| Genre | Superhero |
| Script | John Broome |
| Pencils | Gil Kane |
| Inks | Murphy Anderson |
| Reprinted | in Green Lantern Archives (DC, 1993 series) #3 (April 2001); in Showcase Presents Green Lantern (DC, 2005 series) #2 (February 2007) |