| Issue | #21 |
| Published | June 1952 |
| Cover Price | 0.10 |
| Pages | 36 |
| Editing | Whitney Ellsworth (credited); Julius Schwartz (actual) |
| Genre | science fiction; mystery |
| Pencils | Murphy Anderson |
| Inks | Murphy Anderson |
| Genre | superhero |
| Script | John Broome |
| Pencils | Murphy Anderson |
| Inks | Sy Barry |
| Characters | the 3 Herbert brothers; U.S. Army doctors; hermit; U.S. government investigators |
| Synopsis | The Herbert brothers have absorbed radiation from a meteorite and become scientific geniuses, so the Army puts them to work solving problems and inventing until they vanish. |
| Genre | science fiction |
| Script | Gardner Fox |
| Pencils | Irwin Hasen |
| Inks | Joe Giella |
| Notes | One of the Herbert brothers is named Jeb. |
| Reprinted | In Strange Adventures (DC, 1950 series) #223 (March-April 1970). |
| Genre | science fiction |
| Script | Jack Miller |
| Pencils | Murphy Anderson |
| Inks | Murphy Anderson |
| Notes | Cover story. Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (April 2007). |
| Reprinted | In From Beyond the Unknown #13 (DC, October-November 1971). |
| Script | John Osgood(Broome) |
| Pencils | Bob Oksner |
| Inks | Bernard Sachs |
| Reprinted | in World's Finest Comics (DC, 1941 series) #153 (November 1965) |
| Genre | Fact |
| Notes | Some information for this sequence provided by Arthur Lortie, September 2008. |
| Reprinted | in Mystery in Space (DC, 1951 series) #42; in Superman Supacomic (K. G. Murray, 1959 series) #154 [uncertain] |