| 0 | - | cover | 1 | pencils: Lou Fine; inks: Lou Fine | Yarko |
| 1 | - | comic story | 1 | script: ? [as Floyd Kelly] (signed); pencils: ? [as Floyd Kelly] (signed); inks: ? [as Floyd Kelly] (signed) | |
| 2 | The Old Hex House | comic story | 9 | script: Will Eisner; pencils: Will Eisner; inks: Will Eisner | Yarko the Great (a magician; introduction); Carol Tate (introduction); Mr. Tate (introduction); Shaddiba (villain; introduction; death); Doga (villain; introduction) |
| 3 | Princess Kidnapped | comic story | 2 | | Minnie the Mermaid (introduction; only appearance) |
| 4 | In New York | comic story | 2 | | Don Quixote (introduction); Sancho Panza (introduction); Butch Spumoni (villain; introduction) |
| 5 | Wonders in the News | comic story | 0.6 | | |
| 6 | - | promo (ad from the publisher) | 0.4 | letters: typeset | |
| 7 | - | comic story | 8 | script: S. M. Iger; pencils: S. M. Iger; inks: S. M. Iger | Shorty Shortcake; Suzy; Skippy; Mr. De Welth; Weems; Tiny (villain); The Chief (villain; introduction) |
| 8 | - | comic story | 1 | | |
| 9 | The Panama Assignment | comic story | 4 | script: Adolphe Barreaux; pencils: Adolphe Barreaux; inks: Adolphe Barreaux | Patty O'Day; Ham |
| 10 | Charlie Siringo | text article | 2 | script: Will Eisner; pencils: Bob Powell; inks: Bob Powell | |
| 11 | The Pearl Diver Murders | comic story | 6 | script: Bob Powell; pencils: Bob Powell; inks: Bob Powell | Dr. Fung; Dan Barrister; Frisco (villain; introduction; death); Mike (villain; introduction; death) |
| 12 | The Children's Crusade [Part 1] | text story | 2 | script: Will Eisner | |
| 13 | The Iron Horse Goes Through | comic story | 5 | script: Will Eisner; pencils: Munson Paddock; inks: Munson Paddock | Tex Maxon [Tex Dawson]; Nick Badger (villain; introduction) |
| 14 | - | comic story | 1 | pencils: Charles Wilson | |
| 15 | Filmore Dudd | comic story | 1 | script: S. M. Iger; pencils: S. M. Iger; inks: S. M. Iger | Filmore Dudd |
| 16 | - | comic story | 1 | pencils: Bernard Baily; inks: Bernard Baily | Buddy Ebsen; Doris Nolan; Gladys Swarthout; Wallace Beery; Boris Karloff |
| 17 | The Dancing Spy | comic story | 5 | script: Willis B. Rensie; pencils: Willis B. Rensie; inks: Willis B. Rensie | Claire Conos [Z-19] (introduction); Jack Coe (villain; introduction; death) |
| 18 | The Protection Racketeers | comic story | 4 | pencils: ? [as Harold Vance] | Gang-Buster Robinson; Tips Craven (villain; introduction; death) |
| 19 | Monkey Shines; Added Attraction: Frankfurter Follies of 1939 | comic story | 1 | | |
| 20 | Wonder Stamp Club | text article | 1 | pencils: ? (stamp art from several nations); letters: typeset | |
| 21 | Slight Errors | cartoon | 1 | | |
| 22 | The Panama Plot | comic story | 7 | script: Bob Kane; pencils: Bob Kane; inks: Bob Kane | Spark Stevens; Leach (villain; introduction); Blinky Craven (villain; introduction; death) |
| 23 | - | cartoon | 0.75 | script: S. M. Iger; pencils: S. M. Iger; inks: S. M. Iger | |
| 24 | Wonderworld Comics #3 | promo (ad from the publisher) | 0.25 | | |