| 0 | - | cover | 1 | pencils: George Tuska; inks: George Tuska | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast] |
| 1 | Credits | credits, title page | 1 | letters: typeset | |
| 2 | - | illustration | 1 | pencils: Ross Andru; inks: George Roussos | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Mekano |
| 3 | Contents | table of contents | 1 | letters: typeset | |
| 4 | Introduction | foreword, introduction, preface, afterword | 2 | script: Roy Thomas | |
| 5 | X-Men #32 | cover reprint (on interior page) | 1 | pencils: Jack Kirby, Werner Roth; inks: John Tartaglione | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Juggernaut |
| 6 | Beware the Juggernaut, My Son! | comic story | 20 | script: Roy Thomas; pencils: Werner Roth; inks: John Tartaglione; letters: Artie Simek | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Vera Cantor; Zelda Kurtzberg; Bernard; Candy Southern; Satan's Saints [Rocky Rhodes]; Juggernaut [Cain Marko]; Factor Three |
| 7 | X-Men #33 | cover reprint (on interior page) | 1 | pencils: Gil Kane, Werner Roth, John Romita; inks: Gil Kane, John Romita | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Juggernaut |
| 8 | Into the Crimson Cosmos! | comic story | 20 | script: Roy Thomas; pencils: Werner Roth; inks: John Tartaglione; letters: Sam Rosen | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Doctor Strange [Stephen Strange]; Ancient One; Juggernaut [Cain Marko]; Outcast [Xorak]; Factor Three |
| 9 | X-Men 34 | cover reprint (on interior page) | 1 | pencils: Dan Adkins; inks: Dan Adkins | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Tyrannus |
| 10 | War--In a World of Darkness! | comic story | 20 | script: Roy Thomas; pencils: Dan Adkins; inks: Dan Adkins; letters: Jerry Feldmann | X-Men [Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Ted Roberts; Ralph Roberts; Tyrannus; Mole Man [Harvey Elder]; Carole |
| 11 | X-Men #35 | cover reprint (on interior page) | 1 | pencils: Dan Adkins; inks: Dan Adkins | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Spider-Man |
| 12 | Along Came a Spider... | comic story | 20 | script: Roy Thomas; pencils: Werner Roth; inks: Dan Adkins; letters: Jerry Feldmann | X-Men [Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Spider-Man [Peter Parker]; Banshee [Sean Cassidy]; Factor Three |
| 13 | X-Men #36 | cover reprint (on interior page) | 1 | pencils: Ross Andru; inks: George Roussos | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Mekano |
| 14 | Mekano Lives! | comic story | 20 | script: Roy Thomas; pencils: Ross Andru; inks: George Bell; letters: Sam Rosen | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Mekano [Tom Regal]; Factor Three [Changeling [Kevin Sidney]] |
| 15 | X-Men #37 | cover reprint (on interior page) | 1 | pencils: Don Heck, John Verpoorten | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Mutant Master |
| 16 | We, the Jury... | comic story | 20 | script: Roy Thomas; pencils: Ross Andru; inks: Don Heck; letters: Artie Simek | X-Men [Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Factor Three [Mutant Master; Changeling [Kevin Sidney]; Vanisher [Telford Porter]; Unus [Gunther Bain]; Blob [Fred Dukes]; Mastermind [Jason Wyngarde]] |
| 17 | X-Men #38 | cover reprint (on interior page) | 1 | pencils: Dan Adkins, John Romita; inks: Dan Adkins, John Romita | X-Men [Marvel Girl; Angel; Beast]; Factor Three [Vanisher; Blob] |
| 18 | The Sinister Shadow of...Doomsday! | comic story | 15 | script: Roy Thomas; pencils: Don Heck; inks: George Bell; letters: L. P. Gregory | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Banshee [Sean Cassidy]; Factor Three [Mutant Master; Changeling [Kevin Sidney]; Vanisher [Telford Porter]; Blob [Fred Dukes]] |
| 19 | A Man Called...X | comic story | 5 | script: Roy Thomas; pencils: Werner Roth; inks: John Verpoorten; letters: Sam Rosen | Professor X [Charles Xavier]; Cyclops [Scott Summers]; Fred Duncan |
| 20 | X-Men #39 | cover reprint (on interior page) | 1 | pencils: George Tuska; inks: George Tuska | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast] |
| 21 | The Fateful Finale! | comic story | 15 | script: Roy Thomas; pencils: Don Heck; inks: Vince Colletta; letters: Artie Simek | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Banshee [Sean Cassidy]; Factor Three [Mutant Master; Changeling [Kevin Sidney]; Vanisher [Telford Porter]; Unus [Gunther Bain]; Blob [Fred |
| 22 | Lonely Are the Hunted! | comic story | 5 | script: Roy Thomas; pencils: Don Heck; inks: Vince Colletta; letters: Artie Simek | Professor X [Charles Xavier]; Fred Duncan; Cyclops [Scott Summers]; Jack O'Diamonds [Jack Winters] |
| 23 | X-Men #40 | cover reprint (on interior page) | 1 | pencils: George Tuska; inks: George Tuska | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Frankenstein (android) |
| 24 | The Mark of the Monster! | comic story | 15 | script: Roy Thomas; pencils: Don Heck; inks: George Tuska; letters: Artie Simek | X-Men [Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Frankenstein (android); Professor X |
| 25 | The First Evil Mutant! | comic story | 5 | script: Roy Thomas; pencils: Werner Roth; inks: John Verpoorten; letters: Al Kurzrok | Professor X [Charles Xavier]; Cyclops [Scott Summers]; Jack O'Diamonds [Jack Winters] |
| 26 | X-Men #41 | cover reprint (on interior page) | 1 | pencils: Don Heck; inks: George Tuska | X-Men [Beast; Iceman]; Grotesk |
| 27 | Now Strikes...the Sub-Human! | comic story | 15 | script: Roy Thomas; pencils: Don Heck; inks: George Tuska; letters: Sam Rosen | X-Men [Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Zelda Kurtzberg; Vera Cantor; Grotesk [Gor-Tok]; Professor X |
| 28 | The Living Diamond! | comic story | 5 | script: Roy Thomas; pencils: Werner Roth; inks: John Verpoorten; letters: Sam Rosen | Professor X [Charles Xavier]; Cyclops [Scott Summers]; Jack O'Diamonds [Jack Winters] |
| 29 | X-Men #42 | cover reprint (on interior page) | 1 | pencils: John Buscema; inks: John Buscema | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Professor X |
| 30 | If I Should Die...! | comic story | 15 | script: Roy Thomas; pencils: Don Heck; inks: George Tuska; letters: Sam Rosen | X-Men [Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Grotesk [Gor-Tek]; Professor X |
| 31 | The End...or the Beginning? | comic story | 5 | script: Roy Thomas; pencils: Werner Roth; inks: John Verpoorten; letters: Al Kurzrok | Professor X [Charles Xavier]; Cyclops [Scott Summers]; Living Diamond [Jack Winters] |
| 32 | X-Men #33 Rejected Cover | illustration | 1 | pencils: Gil Kane | |
| 33 | X-Men #38 Unused Cover | illustration | 1 | pencils: George Tuska | |