| Issue | #21 |
| Published | July-August 1959 |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | Jack Schiff |
| Notes | 2nd Rip Hunter |
| Genre | science fiction |
| Pencils | Mike Sekowsky |
| Inks | Joe Giella |
| Notes | 2nd Rip Hunter |
| Reprinted | in Essential Showcase 1956-1959, The (DC, 1992 series) #nn |
| Genre | science fiction |
| Script | Jack Miller |
| Pencils | Mike Sekowsky |
| Inks | Joe Giella |
| Notes | Chapter 1 |
| Genre | science fiction |
| Script | Jack Miller |
| Pencils | Mike Sekowsky |
| Inks | Joe Giella |
| Notes | Chapter 2 |
| Genre | science fiction |
| Script | Jack Miller |
| Pencils | Mike Sekowsky |
| Inks | Joe Giella |
| Notes | Chapter 3 |
| Genre | gag |
| Script | Henry Boltinoff |
| Pencils | Henry Boltinoff |
| Inks | Henry Boltinoff |
| Letters | Henry Boltinoff |
| Notes | Title and first line from Arthur Lortie, added August 2006. |