| Issue | #4 |
| Published | November 1939 |
| Cover Price | 0.10 USD |
| Pages | 68 |
| Editing | Victor Fox? |
| Characters | The Green Mask [Michael Shelby] |
| Pencils | Lou Fine |
| Inks | Lou Fine |
| Characters | The Green Mask [Michael Shelby]; Nicoli (first appearance; villain); Tony (first appearance; villain) |
| Pencils | Walter Frame |
| Inks | Walter Frame |
| Characters | Rex Dexter; Lord Marvel (first appearance; villain; death) |
| Script | Dick Briefer? |
| Pencils | Dick Briefer |
| Inks | Dick Briefer |
| Characters | Billy Bounce |
| Script | Fred Schwab |
| Pencils | Fred Schwab |
| Inks | Fred Schwab |
| Characters | Chen Chang |
| Pencils | Munson Paddock [as Cecilia Munson] |
| Inks | Munson Paddock |
| Characters | Jonson (first appearance) |
| Pencils | George Tuska (Floyd Kelly) |
| Inks | George Tuska |
| Characters | Lt. Drake |
| Pencils | Klaus Nordling |
| Inks | Klaus Nordling |
| Characters | Hemlock Shomes |
| Script | Fred Schwab |
| Pencils | Fred Schwab |
| Inks | Fred Schwab |
| Script | Albert Orbaan |
| Letters | typeset |
| Characters | Captain Savage (first appearance); Bull Thompson (first appearance; villain) |
| Pencils | Art Peddy |
| Inks | Art Peddy |
| Characters | The Blue Beetle [Dan Garrett]; Bull Blackart (first appearance; villain) |
| Script | Will Eisner? |
| Pencils | Charles Nicholas |
| Inks | Charles Nicholas |
| Notes | Blue Beetle gains full-sleeved (official) costume in this story |
| Characters | Inspector Bancroft |
| Pencils | Art Franklin |
| Inks | Art Franklin |
| Characters | D-13 [Richard Anthony]; Martis Urbi (first appearance; villain) |
| Script | Bob Powell? |
| Pencils | Bob Powell |
| Inks | Bob Powell |
| Characters | Denny Scott |
| Pencils | John Lindermayer |
| Inks | John Lindermayer |
| Characters | Simone (first appearance; villain) |
| Script | Will Eisner? |
| Pencils | George Tuska |
| Inks | George Tuska |
| Reprinted | in Blue Beetle (Fox, 1939 series) #5 |