| 0 | - | cover | 1 | pencils: Gil Kane; inks: Murphy Anderson; colors: Alex Sinclair | Atom [Ray Palmer]; Dr. Light [Arthur Light] |
| 1 | Table of Contents | table of contents | 3 | letters: typeset | |
| 2 | Showcase #34 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | Atom [Ray Palmer]; Kulan Dar |
| 3 | Birth of the Atom! | comic story | 10 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer] (intro, origin); Jean Loring (intro) |
| 4 | Battle of the Tiny Titans! | comic story | 15 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | Atom [Ray Palmer]; Kulan Dar; Alma Wilson; Jean Loring; Carl Ballard (villain) |
| 5 | Inside the Atom | text article | 2 | script: Julius Schwartz; pencils: Ben Flinton, E. E. Hibbard; inks: Ben Flinton, E. E. Hibbard | 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] (all as the Justice Society of America/JSA) |
| 6 | Showcase #35 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | Atom [Ray Palmer] |
| 7 | The Dooms from Beyond! | comic story | 25 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | 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 |
| 8 | Inside the Atom [Part 2] | text article | 2 | script: Julius Schwartz | |
| 9 | Showcase #36 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | Atom [Ray Palmer] |
| 10 | Prisoner in a Test Tube! | comic story | 12 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | Atom [Ray Palmer]; Professor Anton Kraft; Professor Loring; Jean Loring |
| 11 | The "Disappearing Act" Robberies! | comic story | 13 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | Atom [Ray Palmer]; Jean Loring; Alma Wilson Barnes; Jim Barnes; Greg Phillips (villain); Mayor Andrews; Jason Saunders (flashback) |
| 12 | Atom #1 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Jason Woodrue |
| 13 | Master of the Plant World! | comic story | 25 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Plant Master [Jason Woodrue, later Floronic Man] (intro, villain); Jean Loring; Maya |
| 14 | Atom #2 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | Atom [Ray Palmer] |
| 15 | The Oddest Man on Earth! | comic story | 13 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Oscar D. Dollar [Mister Odd]; Bart Tranter (villain); Jean Loring; Tim Kerr |
| 16 | The Prisoners Who Vanished! | comic story | 12 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Carl Ballard (villain); Chief Baxter |
| 17 | Atom #3 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Chronos (hands) |
| 18 | The Time Trap! | comic story | 15 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Chronos (villain, intro); Jean Loring |
| 19 | The Secret of "Al Atom's" Lamp! | comic story | 10 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Professor Alpheus V. Hyatt (intro); Abdul the Thief (villain); Hassan; Ayesha |
| 20 | Atom #4 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer] |
| 21 | The Machine That Made "Miracles"! | comic story | 15 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Snapper Carr; Midge; Florence James; Entrol Kol |
| 22 | The Case of the Innocent Thief! | comic story | 10 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Jean Loring; Tom Parks; Elkins (villain) |
| 23 | Atom #5 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer] |
| 24 | The Diamond of Deadly Dooms! | comic story | 15 | script: Gardner Fox; pencils: Gil Kane, Mike Sekowsky; inks: Murphy Anderson | The Atom [Ray Palmer]; Ted Ralston; Karl Jat (villain); Moorn Jor |
| 25 | The Specter of 3000-Moons Lake! | comic story | 10 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Don Morgan; Fred Harris (villain); Jean Loring; Jon Van Dorn |
| 26 | Atom #6 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Dick Turpin |
| 27 | The Riddle of the Two-Faced Astronaut! | comic story | 13 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Jean Loring; Wizardo the Great; Chief Baxter; Peter Venner; Howard Crane (villain) |
| 28 | The Highwayman and the Mighty Mite! | comic story | 12 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Professor Alpheus V. Hyatt; Dick Turpin (villain); Black Bess; Lady Jane; Tom King |
| 29 | Atom #7 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Hawkman [Katar Hol] |
| 30 | The Case of the Cosmic Camera! | comic story | 25 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Hawkman [Katar Hol]; Chief Baxter; Jean Loring; Thanagarians; Hawkgirl [Shayera Thal] (cameo); Thalens (villains) |
| 31 | Atom #8 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Dr. Light [Arthur Light] |
| 32 | Lockup in the Lethal Lightbulb! | comic story | 15 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | Justice League of America [Aquaman; Green Lantern [Hal Jordan]; The Flash [Barry Allen]; Wonder Woman; Batman; Green Arrow; Superman; Martian Manhunter (flashback only); Snapper Carr] (cameo); The Atom [Ray Palmer]]; Dr. Light [Arthur Light]; Jean Loring |
| 33 | The Purloined Miniatures | comic story | 10 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; Bill Wilson; Rodney Morton; Jean Loring; Alfred Trask (villain); Warden Barnes |
| 34 | Atom #9 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | Atom [Ray Palmer] |
| 35 | The Atom's Phantom Double! | comic story | 13 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer] |
| 36 | The Seaman and the Spyglass! | comic story | 12 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; Henry Hudson; Jan Lippershey; Professor Alpheus V. Hyatt |
| 37 | Atom #10 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer] |
| 38 | Ride a Deadly Grenade! | comic story | 13 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Ferdinand Alt; Jean Loring; foreign agents (villains); a C.I.A. agent |
| 39 | The Mysterious Swan-Maiden! | comic story | 12 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; Jean Loring; Judge Emil Potter; Johnny Trent; Rutherford Toller; Bill Cook; The Swan-Maiden (villain) |
| 40 | Atom #11 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Jack Archer |
| 41 | Trouble at the Ten-Year Club! | comic story | 13 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Jack Archer (villain) |
| 42 | Voyage to Beyond! | comic story | 12 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; Jean Loring; Kathis (villain); Anton (villain); Santh (villain) |
| 43 | Atom #12 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer] |
| 44 | Danger -- Atom-Gun at Work! | comic story | 13 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; Jean Loring; Enrichetta Negrini |
| 45 | The Gold Hunters of '49! | comic story | 12 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; Edgar Allan Poe; Professor V. Hyatt; Charles Barr |
| 46 | Atom #13 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Chronos |
| 47 | Weapon Watches of the Time-Wise Guy! | comic story | 15 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; Chronos (villain); Anton Teljas; David Clinton; Jason Thrower; Eva Teljas; Jean Loring |
| 48 | I Accuse Ray Palmer -- of Robbery! | comic story | 10 | script: Gardner Fox; pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Fred Norton (villain); Billy the Wheel (villain) |
| 49 | Atom #14 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer] |
| 50 | Revolt of the Atom's Uniform! | comic story | 24 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; Battling Bob Barnett |
| 51 | Atom #15 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Hyper-Thief |
| 52 | Illusions for Sale! | comic story | 12 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; Jean Loring; Dr. Thayer; Chief Baxter |
| 53 | The Super-Safecracker who Defied the Law! | comic story | 12 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; The Hyper-Thief (villain); Enrichetta Negrini; Jean Loring |
| 54 | Atom #16 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer]; Andrew Frost |
| 55 | Fate of the Flattened-Out Atom! | comic story | 24 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; Andrew Frost (villain); Jean Loring |
| 56 | Atom #17 | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Murphy Anderson | The Atom [Ray Palmer] |
| 57 | Case of the Hooded Hijackers! | comic story | 14 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; The "Highbrow" Dillon Gang (villains); Jean Loring; Bullets Andrews (villain) |
| 58 | Jules Verne's Crystal Ball! | comic story | 10 | script: Gardner Fox; pencils: Gil Kane; inks: Sid Greene | The Atom [Ray Palmer]; Jules Verne; Professor Alpheus V. Hyatt |
| 59 | Showcase Presents | promo (ad from the publisher) | 2 | pencils: various; inks: various; letters: typeset | |
| 60 | The Atom Volume 1: The World's Smallest Super-hero! | promo (ad from the publisher) | 1 | script: Peter Hamboussi | |