| Issue | #12 |
| Published | April 1963 |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Pat Masulli (Executive Editor) |
| Notes | A "Feb. 28" arrival date has been noted on a copy. |
| Characters | Gorgo |
| Genre | monster |
| Pencils | Bill Montes ? |
| Inks | Vince Colletta |
| Notes | Art attribution by Nick Caputo (August 2010). |
| Characters | Reptisaurus |
| Genre | monster |
| Genre | fact; science |
| Genre | fact; science |
| Letters | typeset |
| Reprinted | in Gorgo (Charlton, 1961 series) #21 |
| Genre | science fiction |