| 0 | - | cover | 1 | pencils: Lou Fine; inks: Lou Fine | The Green Mask [Michael Shelby] |
| 1 | The Rule of J. J. Fakin | comic story | 9 | pencils: Walter Frame; inks: Walter Frame | The Green Mask [Michael Shelby]; J. J. Fakin (first appearance; villain; also spelled "Faken") |
| 2 | The Cone-Shaped Planet | comic story | 6 | pencils: Dick Briefer; inks: Dick Briefer | Rex Dexter; Cynde |
| 3 | - | comic story | 2 | script: Norman Lee; pencils: Norman Lee; inks: Norman Lee | |
| 4 | The Railroad Robbery | comic story | 6 | pencils: Cecilia Munson; inks: Cecilia Munson | V: Chen Chang |
| 5 | Death Rides With the Jewel of Timboor | comic story | 3 | pencils: Floyd Kelly; inks: Floyd Kelly | |
| 6 | The Transatlantic Gamblers | comic story | 5 | pencils: Klaus Nordling; inks: Klaus Nordling | Lt. Drake; Basil Older (first appearance; villain) |
| 7 | The Case of the Missing Molars | comic story | 4 | script: Fred Schwab; pencils: Fred Schwab; inks: Fred Schwab | |
| 8 | The Man With the Paraffin Beard | text story | 2 | script: Clyde H. Kleinert | |
| 9 | Villains of the Vulture Head Saloon | comic story | 4 | pencils: Art Peddy; inks: Art Peddy | next app. in GREEN MASK #3 |
| 10 | The Loan Shark Racket | comic story | 4 | script: Will Eisner; pencils: Charles Nicholas; inks: Charles Nicholas | The Blue Beetle [Dan Garret]; Spike (first appearance, villain); Spike's gang (first appearance, villains) |
| 11 | The Killings of Seurat Khan | comic story | 4 | pencils: Art Pinajian; inks: Art Pinajian | Inspector Bancroft; Seurat Khan (first appearance; villain) |
| 12 | The Mystery Sub | comic story | 6 | pencils: Bob Powell; inks: Bob Powell | D-13 [Richard Anthony]; The Nazis (villains) |
| 13 | Elephant Attack | comic story | 4 | pencils: L. Mayor; inks: L. Mayor | |
| 14 | Sanchoo the Smuggler | comic story | 4 | pencils: George Tuska; inks: George Tuska | V: Sanchoo (I) |
| 15 | Famous Detectives | character profile | 1 | script: Lee Harris ? [as Harris] (signed); pencils: Lee Harris [as Harris] (signed); inks: Lee Harris [as Harris] (signed) | Matthew Solomon (detective); Red Collins (villain, bandit) |