| Issue | #12 |
| Published | April-May 1964 |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Julius Schwartz |
| Characters | The Atom [Ray Palmer] |
| Genre | superhero |
| Pencils | Gil Kane |
| Inks | Murphy Anderson |
| Reprinted | in The Atom Archives (DC, 2001 series) #2 (October 2003); in Showcase Presents: The Atom (DC, 2007 series) #1 |
| Characters | The Atom [Ray Palmer]; Jean Loring; Enrichetta Negrini |
| Genre | superhero |
| Script | Gardner Fox |
| Pencils | Gil Kane |
| Inks | Sid Greene |
| Reprinted | in The Atom Archives (DC, 2001 series) #2 (October 2003); in Showcase Presents: The Atom (DC, 2007 series) #1 |
| Characters | The Atom [Ray Palmer]; Edgar Allan Poe; Professor V. Hyatt; Charles Barr |
| Genre | superhero |
| Script | Gardner Fox |
| Pencils | Gil Kane |
| Inks | Sid Greene |
| Notes | A "Time Pool" story. |
| Reprinted | in Detective Comics (DC, 1937 series) #439 (February-March 1974); in The Atom Archives (DC, 2001 series) #2 (October 2003); in Showcase Presents: The Atom (DC, 2007 series) #1 |