| Issue | #21 |
| Published | August-September 1954 |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | Julius Schwartz |
| Genre | science fiction |
| Pencils | Murphy Anderson |
| Inks | Murphy Anderson |
| Genre | science fiction |
| Script | Otto Binder |
| Pencils | Sy Barry |
| Inks | Sy Barry |
| Notes | Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (April 2007). |
| Reprinted | in From Beyond the Unknown (DC, 1969 series) #15 (February-March 1972) |
| Genre | science fiction |
| Script | Otto Binder |
| Pencils | Gil Kane |
| Inks | Bernard Sachs |
| Notes | Pencils and inks credits confirmed by Julius Schwartz's editorial records, provided by DC Comics (13 August 2007) |
| Genre | science fiction |
| Script | Otto Binder |
| Pencils | Howard Sherman |
| Inks | Howard Sherman |
| Notes | Pencils and inks credits confirmed by Julius Schwartz's editorial records, provided by DC Comics (13 August 2007) |
| Genre | science fiction |
| Script | Sid Gerson |
| Pencils | Carmine Infantino |
| Inks | Carmine Infantino |
| Notes | Pencils and inks credits confirmed by Julius Schwartz's editorial records, provided by DC Comics (13 August 2007) |
| Genre | Fact |
| Notes | Information for this sequence from Arthur Lortie, September 2008. Location of this sequence within this issue is unknown. |