| 0 | Grottu! King of the Insects / The Indescribable Diablo / The Miraculous Martian / The Shadow Thing / The Serpent Creature | cover | 1 | pencils: Jack Kirby; inks: Jack Kirby; colors: Stan Goldberg; letters: Artie Simek | |
| 2 | I Unleashed Shagg upon the World! | comic story | 7 | script: Stan Lee, Larry Lieber; pencils: Jack Kirby; inks: Dick Ayers; colors: Stan Goldberg; letters: Artie Simek | Shagg |
| 3 | I Come from the Shadow World! | comic story | 5 | script: Stan Lee; pencils: Steve Ditko; inks: Steve Ditko; colors: Stan Goldberg; letters: Artie Simek | shadow creature; Casey |
| 4 | He Waits For Us in the Glacier! | comic story | 5 | script: Stan Lee, Larry Lieber; pencils: Don Heck; inks: Don Heck; colors: Stan Goldberg; letters: Artie Simek | Anuxa |
| 5 | I Became a...Human Bomb! | comic story | 4 | script: Stan Lee, Larry Lieber; pencils: Paul Reinman; inks: Paul Reinman; colors: Stan Goldberg; letters: Artie Simek | |
| 6 | Grottu, King of the Insects! | comic story | 6 | script: Stan Lee, Larry Lieber; pencils: Jack Kirby; inks: Bill Everett; colors: Stan Goldberg; letters: Artie Simek | Frank [Ulysses Bloodstone] (earliest published appearance according to later continuity); Lynn Avery (only appearance); Kasenga (only appearance); Grottu (introduction, origin) |
| 7 | I Know the Secret of the Poltergeist! | comic story | 6 | pencils: Steve Ditko; inks: Steve Ditko; colors: Stan Goldberg; letters: Artie Simek | Larry Winters; Rita Winters; Poltergeist |
| 8 | I Saw the Serpent that Saved the World! | comic story | 5 | script: Stan Lee, Larry Lieber; pencils: Don Heck; inks: Don Heck; colors: Stan Goldberg; letters: Artie Simek | |
| 9 | The Stranger in Space! | comic story | 4 | pencils: John Forte; inks: John Forte; colors: Stan Goldberg; letters: Artie Simek | |
| 10 | I Saw Diablo! The Demon from the Fifth Dimension! | comic story | 7 | script: Stan Lee; pencils: Jack Kirby; inks: Dick Ayers; colors: Stan Goldberg; letters: Artie Simek | Diablo; Ulysses Bloodstone (unnamed, identified in later retcon) |
| 11 | I Found the Giant in the Sky! | comic story | 5 | pencils: Steve Ditko; inks: Steve Ditko; colors: Stan Goldberg; letters: Ray Holloway, Artie Simek | Prof. Dunn; giant; princess |
| 12 | Beware!! The Ghosts Surround Me!! | comic story | 6 | script: Stan Lee, Larry Lieber; pencils: Don Heck; inks: Don Heck; colors: Stan Goldberg; letters: Artie Simek | Gustav; Hans (only appearance for both) |
| 13 | I Saw the Invasion of the Stone Men | comic story | 5 | pencils: Steve Ditko; inks: Steve Ditko; colors: Stan Goldberg; letters: Artie Simek | Prof. George Ailen |
| 14 | A Martian Walks Among Us! | comic story | 7 | script: Stan Lee, Larry Lieber; pencils: Jack Kirby; inks: Dick Ayers; colors: Stan Goldberg; letters: Artie Simek | |