| Issue | #1 |
| Published | Summer 1940 |
| Cover Price | 0.10 USD |
| Pages | 68 |
| Editing | Victor Fox |
| Characters | Green Mask [Michael Shelby] |
| Pencils | Lou Fine |
| Inks | Lou Fine |
| Characters | The Green Mask [Michael Shelby] (origin); Domino [Don] (first appearance; origin); Sen. Shelby (first appearance; death; Green Mask's father); Prof. Lascomb (first appearance); The Grim Circle [John Sebastion; others] (first appearance; villains); Red Simpson (first appearance; villain) |
| Genre | Superhero |
| Pencils | Walter Frehm? |
| Inks | Walter Frehm? |
| Notes | Takes place before MYSTERY MEN COMICS #1, even though Domino does not appear there before issue #11. |
| Characters | The Green Mask [Michael Shelby] |
| Pencils | Walter Frehm? |
| Inks | Walter Frehm? |
| Reprinted | from MYSTERY MEN COMICS #3 |
| Characters | The Green Mask [Michael Shelby] |
| Pencils | Walter Frehm? |
| Inks | Walter Frehm? |
| Reprinted | from MYSTERY MEN COMICS #2 |
| Characters | The Green Mask [Michael Shelby] |
| Script | Edward Young |
| Letters | typeset |
| Characters | The Green Mask [Michael Shelby] |
| Pencils | Walter Frehm? |
| Inks | Walter Frehm? |
| Reprinted | from MYSTERY MEN COMICS #5 |
| Characters | The Green Mask [Michael Shelby] |
| Pencils | Walter Frehm? |
| Inks | Walter Frehm? |
| Reprinted | from MYSTERY MEN COMICS #6 |
| Characters | The Green Mask [Michael Shelby] |
| Pencils | Walter Frehm? |
| Inks | Walter Frehm? |
| Reprinted | from MYSTERY MEN COMICS #7 |
| Characters | The Green Mask [Michael Shelby] |
| Pencils | Walter Frehm? |
| Inks | Walter Frehm? |
| Reprinted | from Mystery Men Comics (Fox, 1939 series) #1 [pgs. 1-3 only] |