| 0 | - | cover | 1 | pencils: Werner Roth; inks: John Tartaglione; colors: Dean White | Banshee, Beast, Sean Cassidy, Cyclops, Bobby Drake, Jean Grey, Iceman, Marvel Girl, Hank McCoy, Mimic, Calvin Rankin, Scott Summers |
| 1 | The Marvel Masterworks Library | promo (ad from the publisher) | 1 | letters: typeset | |
| 2 | Marvel Masterworks: The X-Men Volume 3 | credits, title page | 3 | letters: typeset | |
| 3 | - | illustration | 1 | | |
| 4 | Marvel Masterworks | table of contents | 1 | letters: typeset | |
| 5 | Introduction | foreword, introduction, preface, afterword | 2 | script: Roy Thomas | |
| 6 | Divided We Fall! | cover reprint (on interior page) | 1 | pencils: Werner Roth; inks: Dick Ayers; colors: Stan Goldberg, Marie Severin; letters: Sam Rosen | X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Beast; Angel; Iceman]; Count Nefaria; Unicorn; Eel [Leopold Stryke]; Porcupine; Scarecrow; Plant Man |
| 7 | Divided -- We Fall! | comic story | 20 | script: Roy Thomas; pencils: Jay Gavin; inks: Dick Ayers; letters: Artie Simek | X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Beast; Angel; Iceman]; GUESTS: Zelda; Vera; VILLAINS: Count Nefaria; Maggia; Eel [Leopold Stryke]; Porcupine; Unicorn; Scarecrow; Plant Man |
| 8 | To Save a City! | cover reprint (on interior page) | 1 | pencils: Werner Roth; inks: Dick Ayers; colors: Stan Goldberg; letters: Sam Rosen | X-Men [Cyclops; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Beast; Iceman]; Eel [Leopold Stryke]; Porcupine; Plant Man; Unicorn; Scarecrow |
| 9 | To Save a City | comic story | 20 | script: Roy Thomas; pencils: Werner Roth; inks: Dick Ayers; letters: Artie Simek | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Beast; Iceman]; Count Nefaria; Plant Man; Eel [Leopold Stryke]; Porcupine; Unicorn; Scarecrow; General Fredericks; Colonel Hendershoot |
| 10 | The Plague of the Locust! | cover reprint (on interior page) | 1 | pencils: Werner Roth; inks: Dick Ayers; colors: Stan Goldberg, Marie Severin; letters: Sam Rosen | The X-Men [Cyclops; Marvel Girl; Angel; Beast; Iceman]; Locust [August Hopper] |
| 11 | The Plague of... the Locust! | comic story | 20 | script: Roy Thomas; pencils: Werner Roth; inks: Dick Ayers; letters: Sam Rosen | The X-Men [Professor X; Cyclops; Marvel Girl; Angel; Beast; Iceman]; Ted Roberts; The Locust [August Hopper] |
| 12 | The Menace of El Tigre! | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Dick Ayers; colors: Stan Goldberg, Marie Severin; letters: Sam Rosen | The X-Men [Beast, Iceman, Cyclops, Angel]; Kukulcan |
| 13 | The Power and the Pendant! | comic story | 20 | script: Roy Thomas; pencils: Werner Roth; inks: Dick Ayers; letters: Sam Rosen | The X-Men (Professor X, Cyclops, Marvel Girl, Angel, Beast, Iceman); El Tigre (villain, introduction, origin; aka Kukulcan) |
| 14 | Holocaust! | cover reprint (on interior page) | 1 | pencils: Werner Roth, Jack Kirby; inks: Dick Ayers; colors: Stan Goldberg, Marie Severin; letters: Morrie Kuramoto | The X-Men [Cyclops; Angel; Beast; Iceman]; Kukulcan |
| 15 | Holocaust! | comic story | 20 | script: Roy Thomas; pencils: Werner Roth; inks: Dick Ayers; letters: Sam Rosen | The X-Men [Professor X; Cyclops; Marvel Girl; Angel; Beast; Iceman]; Kukulcan; Calvin Rankin [The Mimic]; Ted Roberts |
| 16 | Re-Enter: The Mimic! | cover reprint (on interior page) | 1 | pencils: Werner Roth; inks: Dick Ayers; colors: Stan Goldberg, Marie Severin; letters: Sam Rosen | The X-Men [Beast; Marvel Girl [Jean Grey]; Iceman; Cyclops]; the Mimic |
| 17 | Re-Enter: The Mimic! | comic story | 20 | script: Roy Thomas; pencils: Werner Roth; inks: Dick Ayers; letters: Sam Rosen | X-Men [Professor X [Charles Xavier]; Beast; Iceman; Cyclops; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]]; Mimic (joins the X-Men); Quicksilver; Scarlet Witch; Spider-Man [Peter Parker]; Puppet Master; Defender (introduction, an android); Ted Roberts; Zelda; Fantastic Four [Mr. Fantastic |
| 18 | The Wail of the Banshee! | cover reprint (on interior page) | 1 | pencils: Werner Roth; inks: John Tartaglione; colors: Stan Goldberg, Marie Severin; letters: Sam Rosen, Morrie Kuramoto | The X-Men [Cyclops; Marvel Girl; Beast; Iceman]; the Mimic; Banshee |
| 19 | The Wail of the Banshee! | comic story | 20 | script: Roy Thomas; pencils: Werner Roth; inks: John Tartaglione; letters: Artie Simek, Sam Rosen | X-Men [Professor X; Cyclops; Marvel Girl; Beast; Iceman; Mimic]; The Banshee [Sean Cassidy] (introduction); Ogre (introduction); Factor Three (introduction); Ted Roberts (cameo) |
| 20 | - | cover reprint (on interior page) | 1 | pencils: Werner Roth; inks: John Tartaglione; colors: Stan Goldberg, Marie Severin; letters: Morrie Kuramoto | The X-Men [Beast; Iceman; Cyclops; Marvel Girl; Angel]; Mimic; Super-Adaptoid |
| 21 | When Titans Clash! | comic story | 20 | script: Roy Thomas; pencils: Werner Roth; inks: John Tartaglione; letters: Sam Rosen, Artie Simek | The X-Men [Professor X [Charles Xavier]; Beast [Henry McCoy]; Iceman [Bobby Drake]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]]; Mimic [Calvin Rankin]; Super-Adaptoid (villain) |
| 22 | The Warlock Wakes! | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: John Tartaglione; colors: Stan Goldberg, Marie Severin; letters: Sam Rosen | The X-Men [Beast; Iceman; Cyclops; Marvel Girl; Angel]; The Warlock |
| 23 | The Warlock Wakes! | comic story | 20 | script: Roy Thomas; pencils: Jack Sparling; inks: John Tartaglione; letters: Artie Simek | The X-Men [Beast; Iceman; Cyclops; Marvel Girl; Angel]; The Mad Merlin [The Warlock]; Thor (cameo, flashback) |
| 24 | We Must Destroy... the Cobalt Man! | cover reprint (on interior page) | 1 | pencils: Dan Adkins; inks: Dan Adkins; colors: Stan Goldberg, Marie Severin; letters: Sam Rosen | Angel; Beast; Cyclops; Iceman; Marvel Girl [Jean Grey]; Cobalt Man |
| 25 | We Must Destroy... the Cobalt Man! | comic story | 20 | script: Roy Thomas; pencils: Werner Roth; inks: John Tartaglione; letters: Sam Rosen | X-Men [Angel; Beast; Cyclops; Iceman; Marvel Girl [Jean Grey]; Professor X]; Candy Southern (first appearance; Spelled Sothern); Ted Roberts; Zelda; Vera; Bernard The Poet; Cobalt Man [Ralph Roberts] (first appearance); Iron Man (cameo) |
| 26 | The X-Men #25 Unused Cover Art | illustration | 1 | pencils: Werner Roth; inks: Werner Roth | |
| 27 | The X-Men #24 Page 9 Art | illustration | 1 | pencils: Werner Roth; inks: Dick Ayers | |
| 28 | The X-Men #24 Page 11 Art | illustration | 1 | pencils: Werner Roth; inks: Dick Ayers | |
| 29 | The X-Men #27 Page 17 Art | illustration | 1 | pencils: Werner Roth; inks: Dick Ayers | |
| 30 | The X-Men #27 Page 19 Art | illustration | 1 | pencils: Werner Roth; inks: Dick Ayers | |
| 31 | Biographies | foreword, introduction, preface, afterword | 1 | script: John Rhett Thomas | |
| 32 | The Marvel Masterworks | promo (ad from the publisher) | 1 | letters: typeset | |
| 33 | Marvel Masterworks: The Sub-Mariner Volume 1 | promo (ad from the publisher) | 1 | letters: typeset | |
| 34 | - | promo (ad from the publisher) | 1 | letters: typeset | |