| Issue | #21 |
| Published | March 1968 |
| Frequency | Quarterly |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | ? |
| Notes | 10053-803. |
| Pencils | ? (painted) |
| Inks | ? (painted) |
| Colors | ? (painted) |
| Letters | typeset |
| Reprinted | in Avontuur Classics (Classics/Williams, 1961 series) #18107 [cover] |
| Pencils | Joe Certa |
| Inks | Joe Certa |
| Letters | Ben Oda (story logo) |
| Pencils | Joe Orlando |
| Inks | Joe Orlando |
| Pencils | Joe Certa(?) |
| Inks | Joe Certa(?) |
| Letters | Ben Oda |
| Pencils | Andre LeBlanc |
| Inks | Andre LeBlanc |
| Letters | Ben Oda |
| Reprinted | in Mystery Comics Digest (Gold Key, 1972 series) #17 (May 1974) |
| Pencils | Luis Dominguez |
| Inks | Luis Dominguez |
| Letters | Ben Oda |
| Reprinted | in Mystery Comics Digest (Gold Key, 1972 series) #23 (May 1975) |
| Pencils | Jeff Jones |
| Inks | Jeff Jones |
| Letters | Ben Oda (story logo) |
| Reprinted | in Mystery Comics Digest (Gold Key, 1972 series) #14 (October 1973); in Mystery Comics Digest (Gold Key, 1972 series) #26 (October 1975) |
| Pencils | Joe Certa |
| Inks | Joe Certa |