| Issue | #52 |
| Published | June 1959 |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | Julius Schwartz |
| Notes | Additional information and sequence information for fillers provided by Donald Dale Milne (August 28, 2003). |
| Characters | Captain Bill Martin; Cyresian |
| Genre | science fiction |
| Pencils | Gil Kane (signed) |
| Inks | Gil Kane (signed) |
| Notes | Additional information and sequence information for fillers provided by Donald Dale Milne (August 28, 2003). |
| Characters | Captain Bill Martin; Cyresian scientists; Yann army personnel. |
| Synopsis | Captain Bill Martin discovers a Cyresian on Mars and then assists the Cyresians to forstall an attack on them by the Yann. |
| Genre | science fiction |
| Script | Gardner Fox |
| Pencils | Mike Sekowsky |
| Inks | Bernard Sachs |
| Notes | Pencils and inks credits from Julius Schwartz's editorial records, provided to the GCD by DC Comics (2 February 2008) |
| Synopsis | Science information on mathematician and astronomer Leonard Euler accompanied by illustrations. |
| Genre | Fact |
| Characters | Ken Carver; Intergalactic Surveying Bureau; Clygor (photo); Manu; Thorl; Karr-Vir |
| Synopsis | In the 24th century, explorer Ken Carver is contacted by stranded explorer Karr-Vir from a reverse universe, and rescues him after a search on three other planets. |
| Genre | science fiction |
| Script | Otto Binder |
| Pencils | Manny Stallman |
| Inks | John Giunta |
| Notes | Pencils and inks credits from Julius Schwartz's editorial records, provided to the GCD by DC Comics (2 February 2008) |
| Characters | Fred; Jimmy; baseball coach |
| Synopsis | Fred finds that there are other ways to participate in his favorite activity of baseball, despite physical limitations or being rejected for the team. |
| Genre | fact |
| Script | Jack Schiff |
| Pencils | Bernard Baily |
| Inks | Bernard Baily |
| Letters | Ira Schnapp |
| Notes | Credits from a list by Lionel English via Donald Dale Milne. |
| Synopsis | Lloyd Vincent recounts how he solved a mystery and prevented an alien from stealing earth from its orbit for a contest. Story hinges on the geography of King County, Maryland. |
| Genre | science fiction |
| Script | Otto Binder |
| Pencils | Frank Giacoia |
| Inks | Frank Giacoia |
| Notes | 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 (DC, 1969 series) #2 December 1969 - January 1970 |
| Synopsis | Science information on unusual planetary satellites accompanied by illustrations. |
| Genre | Fact |