| 0 | - | cover | 1 | pencils: Nick Cardy; inks: Nick Cardy | |
| 1 | Invasion from Uranus | comic story | 8 | pencils: Alex Blum; inks: Alex Blum | The Red Comet (origin); The Uranians (villains, introduction, death) |
| 2 | World Without Light | comic story | 6 | pencils: Henry Kiefer; inks: Henry Kiefer | King Thermo of Mercury (introduction); Baron Burno (villain, introduction) |
| 3 | - | comic story | 6 | pencils: Witmer Williams; inks: Witmer Williams | Jack North (guest-star); Blaga Daru (villain) |
| 4 | - | comic story | 8 | script: ? [as Starr Gayza] | Martians (villains) |
| 5 | What Are the Actual Possibilities of Space Travel? | illustration | 1 | pencils: Gene Fawcette; inks: Gene Fawcette | |
| 6 | An Elementary Course In Astronautics | comic story | 2 | pencils: Gene Fawcette, Witmer Williams; inks: Gene Fawcette, Witmer Williams | |
| 7 | Moon Monster | text story | 2 | script: Jack Anthony | |
| 8 | Menace of the Shrinking People | comic story | 7 | script: ? [as Beekman Terrill] | Princess Eelo (villain, introduction, death) |
| 9 | Stampede on the Star Trail | comic story | 6 | script: Bob Jordan; pencils: Charles Sultan; inks: Charles Sultan | Jytern (villain, introduction, death) |
| 10 | - | comic story | 5 | pencils: Henry Kiefer; inks: Henry Kiefer | Dirk (introduction); Martians (villains) |
| 11 | Death from the Deep | comic story | 7 | pencils: Witmer Williams; inks: Witmer Williams | Rogo (introduction); Rigoro (villain, introduction, death) |
| 12 | - | comic story | 6 | script: Ray Alexander; pencils: George Tuska; inks: George Tuska | Cosmo Corrigan (introduction); Plutonians (guest-star) |