| 0 | - | cover | 1 | pencils: Jack Kirby; inks: Sol Brodsky, Frank Giacoia | |
| 1 | Table of Contents | table of contents | 1 | letters: typeset | |
| 2 | Introduction | foreword, introduction, preface, afterword | 2 | script: Stan Lee | |
| 3 | X-Men #1 | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Paul Reinman, Sol Brodsky, Frank Giacoia | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Magneto |
| 4 | X-Men | comic story | 23 | script: Stan Lee; pencils: Jack Kirby; inks: Paul Reinman; colors: Christie Scheele; letters: Sam Rosen; editing: Stan Lee | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Magneto |
| 5 | X-Men #2 | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Paul Reinman; colors: Christie Scheele; letters: Sam Rosen | X-Men [Professor X; Cyclops; Marvel Girl; Angel; Iceman; Beast]; Vanisher |
| 6 | No One Can Stop the Vanisher! | comic story | 22 | script: Stan Lee; pencils: Jack Kirby; inks: Paul Reinman; colors: Christie Scheele; letters: Sam Rosen; editing: Stan Lee | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Vanisher [Telford Porter] |
| 7 | X-Men #3 | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Sol Brodsky; colors: Christie Scheele | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Blob |
| 8 | Beware of the Blob! | comic story | 24 | script: Stan Lee; pencils: Jack Kirby; inks: Paul Reinman; colors: Christie Scheele; letters: Artie Simek; editing: Stan Lee | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Blob [Fred Dukes] |
| 9 | X-Men #4 | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Paul Reinman, George Roussos; colors: Christie Scheele | X-Men [Professor X; Cyclops; Marvel Girl; Angel; Iceman; Beast]; Brotherhood of Evil Mutants [Magneto; Mastermind; Toad; Quick Silver; Scarlet Witch] |
| 10 | The Brotherhood of Evil Mutants! | comic story | 23 | script: Stan Lee; pencils: Jack Kirby; inks: Paul Reinman; colors: Christie Scheele; letters: Artie Simek; editing: Stan Lee | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Brotherhood of Evil Mutants [Magneto; Mastermind [Jason Wyngarde]; Toad [Mortimer Toynbee]; Quick Silver [Pietro Maximoff]; Scarlet Witch |
| 11 | X-Men #5 | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Paul Reinman; colors: Christie Scheele; letters: Artie Simek | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Brotherhood of Evil Mutants [Magneto; Mastermind; Toad; Quick Silver; Scarlet Witch] |
| 12 | Trapped: One X-Man! | comic story | 24 | script: Stan Lee; pencils: Jack Kirby; inks: Paul Reinman; colors: Christie Scheele; letters: Sam Rosen; editing: Stan Lee | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Brotherhood of Evil Mutants [Magneto; Mastermind [Jason Wyngarde]; Toad [Mortimer Toynbee]; Quick Silver [Pietro Maximoff]; Scarlet Witch |
| 13 | X-Men #6 | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Chic Stone; colors: Evelyn Stein | X-Men [Professor X; Cyclops; Marvel Girl; Angel; Iceman; Beast]; Brotherhood of Evil Mutants [Magneto; Mastermind; Toad; Quick Silver; Scarlet Witch]; Sub-Mariner |
| 14 | Sub-Mariner! Joins the Evil Mutants | comic story | 22 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; colors: Evelyn Stein; letters: Sam Rosen; editing: Stan Lee | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Brotherhood of Evil Mutants [Magneto; Mastermind [Jason Wyngarde]; Toad [Mortimer Toynbee]; Quick Silver [Pietro Maximoff]; Scarlet Witch |
| 15 | X-Men #7 | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Chic Stone; colors: Evelyn Stein | X-Men [Professor X; Cyclops; Marvel Girl; Angel; Iceman; Beast]; Brotherhood of Evil Mutants [Magneto; Mastermind; Toad; Quick Silver; Scarlet Witch]; Blob |
| 16 | The Return of the Blob | comic story | 22 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; colors: Evelyn Stein; letters: Artie Simek; editing: Stan Lee | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Brotherhood of Evil Mutants [Magneto; Mastermind [Jason Wyngarde]; Toad [Mortimer Toynbee]; Quick Silver [Pietro Maximoff]; Scarlet Witch |
| 17 | X-Men #8 | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Chic Stone; colors: Evelyn Stein | X-Men [Professor X; Cyclops; Marvel Girl; Angel; Iceman; Beast]; Unus |
| 18 | Unus the Untouchable! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; colors: Evelyn Stein; letters: Sam Rosen; editing: Stan Lee | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Unus [Gunther Bain] (first appearance); Mastermind [Jason Wyngarde] |
| 19 | X-Men #9 | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Chic Stone; colors: Christie Scheele | X-Men [Professor X; Cyclops; Marvel Girl; Angel; Iceman; Beast]; Avengers [Thor; Captain America; Iron Man; Giant-Man]; Lucifer |
| 20 | Enter, the Avengers! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; colors: Christie Scheele; letters: Sam Rosen; editing: Stan Lee | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Avengers [Thor [Donald Blake]; Captain America [Steve Rogers]; Iron Man [Tony Stark]; Giant-Man [Hank Pym]; Wasp [Janet Van Dyne]]; Lucife |
| 21 | X-Men #10 | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Chic Stone; colors: Evelyn Stein | X-Men [Cyclops; Marvel Girl; Angel; Iceman; Beast]; Ka-Zar |
| 22 | The Coming of...Ka-Zar! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; colors: Evelyn Stein; letters: Sam Rosen; editing: Stan Lee | X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; Ka-Zar |