| 0 | Dust Jacket | cover | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon | Atom [Ray Palmer] |
| 1 | Title Page | credits, title page | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon | |
| 2 | Copyright | credits, title page | 1 | letters: typeset | |
| 3 | Table of Contents | table of contents | 2 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon | |
| 4 | Foreword | foreword, introduction, preface, afterword | 3 | script: Les Daniels; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon | |
| 5 | [Cover - Showcase #34]; Battle of the Tiny Titans! | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Kulan Dar |
| 6 | Birth of the Atom! | comic story | 9.67 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | The Atom [Ray Palmer] (intro, origin); Jean Loring (intro) |
| 7 | Battle of the Tiny Titans! | comic story | 14.33 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Kulan Dar; Alma Wilson; Jean Loring; Carl Ballard (villain) |
| 8 | Inside the Atom | text article | 2 | script: Julius Schwartz; pencils: Ben Flinton, E. E. Hibbard; inks: Ben Flinton, E. E. Hibbard; colors: Digital Chameleon; editing: Julius Schwartz | Justice Society of America [JSA; Atom [Al Pratt]; Sandman [Wesley Dodds]; Spectre [Jim Corrigan]; Flash [Jay Garrick]; Hawkman [Carter Hall]; Dr. Fate [Kent Nelson]; Green Lantern [Alan Scott]; Hourman [Rex Tyler]] |
| 9 | [Cover - Showcase #35]; Dooms from Beyond! | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer] |
| 10 | The Dooms from Beyond! | comic story | 24 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Dr. Gordon Doolin [Gordon Heath]; Jean Loring; Judge Myles Heath (flashback); Goody Wilson (flashback); Ebenezer Heath (flashback); Mrs. Hathaway; Jenkins; Betty; Peter; Tim; Bates (villain); Tom |
| 11 | Inside the Atom | text article | 2 | pencils: Gil Kane; inks: Murphy Anderson | Gardner Fox; Gil Kane; Murphy Anderson |
| 12 | [Cover - Showcase #36]; Prisoner in a Test Tube! | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer] |
| 13 | Prisoner in a Test Tube! | comic story | 11.33 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Professor Anton Kraft; Professor Loring; Jean Loring |
| 14 | The "Disappearing Act" Robberies! | comic story | 12.67 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Jean Loring; Alma Wilson Barnes; Jim Barnes; Greg Phillips (villain); Mayor Andrews; Jason Saunders (flashback) |
| 15 | [Cover - The Atom #1]; Master of the Plant World! | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; letters: Ira Schnapp; editing: Julius Schwartz | Atom [Ray Palmer]; Jason Woodrue |
| 16 | Master of the Plant World! | comic story | 24.67 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; letters: Gaspar Saladino; editing: Julius Schwartz | Atom [Ray Palmer]; Plant Master [Jason Woodrue, later Floronic Man] (intro, villain); Jean Loring; Maya |
| 17 | [Cover - The Atom #2]; The Oddest Man on Earth! | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer] |
| 18 | The Oddest Man on Earth! | comic story | 12.33 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Oscar D. Dollar [Mister Odd]; Bart Tranter (villain); Jean Loring; Tim Kerr |
| 19 | The Prisoners Who Vanished! | comic story | 11.67 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Carl Ballard (villain); Chief Baxter |
| 20 | [Cover - The Atom #3]; The Time Trap! | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Chronos (hands) |
| 21 | The Time Trap! | comic story | 14.33 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Chronos (villain, intro); Jean Loring |
| 22 | The Secret of "Al Atom's" Lamp! | comic story | 9.67 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Professor Alpheus V. Hyatt (intro); Abdul the Thief (villain); Hassan; Ayesha |
| 23 | [Cover - The Atom #4]; Case of the Innocent Thief! | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer] |
| 24 | The Machine That Made "Miracles"! | comic story | 14.33 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Snapper Carr; Midge; Florence James; Entrol Kol |
| 25 | The Case of the Innocent Thief! | comic story | 9.67 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Jean Loring; Tom Parks; Elkins (villain) |
| 26 | [Cover - The Atom #5]; Diamond of Deadly Dooms! | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer] |
| 27 | The Diamond of the Deadly Dooms! | comic story | 14.33 | script: Gardner Fox; pencils: Gil Kane, Mike Sekowsky; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Ted Ralston; Karl Jat (villain); Moorn Jor |
| 28 | The Specter of 3000-Moons Lake! | comic story | 9.33 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Don Morgan; Fred Harris (villain); Jean Loring; Jon Van Dorn |
| 29 | Contributors | text article | 1 | script: Mark Waid | |
| 30 | Backcover | promo (ad from the publisher) | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Digital Chameleon; editing: Julius Schwartz | Atom [Ray Palmer]; Kulan Dar; Jason Woodrue |