| 0 | - | cover | 1 | pencils: Edd Ashe; inks: Edd Ashe | The Dart [Caius Martius Wheeler]; Ace [Ace Barlow] |
| 1 | The Motor Company Mobsters | comic story | 10 | pencils: ? [as Jerry Arbo] (signed); inks: ? [as Jerry Arbo] (signed) | The Dart [Caius Martius Wheeler] (school teacher); Ace [Ace Barlow]; Betty (student); Basco (villain, motor company President, introduction); Alvo (villain, introduction); Nick (villain, introduction) |
| 2 | Science vs. Sorcery | comic story | 8 | pencils: Don Rico; inks: Don Rico | Sorceress of Zoom (villain); Super-Scientist (introduction, turned into a rat) |
| 3 | Stop Doctor Mortal! | comic story | 8 | script: Bert Whitman; pencils: Bert Whitman; inks: Bert Whitman | Gary (Mortal's nephew); Marlene (Mortal's niece); Policemen (many die); Dr. Mortal (villain, scientist); Ulan (villain, Mortal's assistant, introduction, death) |
| 4 | The Super-Science Spies | comic story | 6 | script: Joe Simon; pencils: Bob Webb; inks: Bob Webb | Dynamo [Jim Andrews] (electrical expert); Ingres (death); Stark (villain, detective); Stark's gang (villains, introduction for all) |
| 5 | The Rudite Crystals | comic story | 8 | pencils: Louis Cazeneuve; inks: Louis Cazeneuve | Marga; Ted Grant; Professor Reid; Mr. Brunt (villain); glacial savages (villains, some die) |
| 6 | The Sword of Marduk | text story | 2 | script: Nathaniel Nitkin | |
| 7 | The Coming of the Eagle | comic story | 10 | pencils: Louis Cazeneuve; inks: Louis Cazeneuve | The Eagle [Bill Powers] (origin, brief mention); Jason; Mr. Thorne; Browden; Rider (villain, introduction); Otho (villain) |
| 8 | A Princess of Ur | comic story | 6 | pencils: ? [as Spencer Allen] (signed); inks: ? [as Spencer Allen] (signed) | Blast Bennett; Lua (introduction); Alla (introduction); King of Urol (villain, introduction, death) |
| 9 | The Undersea Tanks | comic story | 4 | script: Frank Pensley; pencils: Bert Whitman; inks: Bert Whitman | Navy Jones; Princess Coral; Captain Nemo; Dictator of Europe (villain, introduction); General Von Rothmann (villain, introduction, death) |