| Issue | #21 |
| Published | October 1977 |
| Cover Price | 0.30 |
| Pages | 36 |
| Editing | Roy Thomas. consulting=Archie Goodwin |
| Genre | superhero |
| Script | Bill Everett |
| Pencils | Gil Kane |
| Inks | Frank Giacoia |
| Letters | Irving Watanabe |
| Characters | With Union Jack & Dyna-Mite |
| Genre | superhero |
| Script | Roy Thomas |
| Pencils | Frank Robbins |
| Inks | Frank Springer |
| Colors | Sam Kato |
| Letters | John Costanza |
| Notes | With Union Jack & Dyna-Mite |
| Genre | superhero |
| Script | Bill Everett |
| Pencils | Bill Everett |
| Inks | Bill Everett |
| Reprinted | from Marvel Mystery Comics (Marvel, 1939 series) #10 (August 1940) |