| 0 | - | cover | 1 | pencils: Bruce Timm; inks: Bruce Timm; colors: Marie Javins | The X-Men [The Angel; The Beast; Iceman; Cyclops; Marvel Girl] |
| 1 | Marvel | credits, title page | 1 | letters: typeset | |
| 2 | The Essential Uncanny X-Men | credits, title page | 1 | pencils: Jack Kirby; inks: Paul Reinman; letters: Sam Rosen | The X-Men [Professor X; The Angel; The Beast; Iceman; Cyclops; Marvel Girl] |
| 3 | - | credits, title page | 3 | pencils: Jack Kirby, Werner Roth; inks: Werner Roth, Dick Ayers | Sentinel; Magneto |
| 4 | - | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Sol Brodsky, Frank Giacoia; letters: Art Simek | X-Men [Professor X [Charles Xavier]; Angel [Warren Worthington III]; Beast [Henry McCoy]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Iceman [Bobby Drake]]; Magneto |
| 5 | X-Men | comic story | 23 | script: Stan Lee; pencils: Jack Kirby; inks: Paul Reinman; letters: S. Rosen | Professor X [Charles Xavier] (first appearance); X-Men [Cyclops [Scott Summers] (first appearance); Beast [Henry McCoy] (first appearance); Angel [Warren Worthington III] (first appearance); Iceman [Bobby Drake] (first appearance); Marvel Girl [Jean Grey] (first appearance)]; Magneto (1st for all ap |
| 6 | Nothing Can Stop the Vanisher! | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Paul Reinman; letters: Sam Rosen | The X-Men [Professor X; The Angel; The Beast; Cyclops; Marvel Girl [Jean Grey]; Iceman]; The Vanisher |
| 7 | No One Can Stop the Vanisher | comic story | 22 | script: Stan Lee; pencils: Jack Kirby; inks: Paul Reinman; letters: Sam Rosen | The X-Men [Professor X [Professor Charles Xavier]; The Angel [Warren Worthington]; The Beast [Hank McCoy]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Iceman [Bobby Drake]]; The Vanisher (first appearance); Special Agent Fred Duncan |
| 8 | Beware of the Blob! | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Sol Brodsky; letters: Sam Rosen | The X-Men [The Angel [Warren Worthington III]; The Beast; Cyclops; Marvel Girl [Jean Grey]; Iceman]; The Blob |
| 9 | Beware of the Blob! | comic story | 24 | script: Stan Lee; pencils: Jack Kirby; inks: Paul Reinman; letters: Art Simek | The X-Men [Professor X [Charles Xavier]; The Angel [Warren Worthington III]; The Beast [Hank McCoy]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Iceman [Bobby Drake]]; The Blob (introduction) |
| 10 | The Brotherhood of Evil Mutants | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: George Roussos; letters: Artie Simek | The X-Men [Professor X [Professor Charles Xavier]; The Angel [Warren Worthington}; The Beast [Hank McCoy]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Iceman [Bobby Drake]]; The Brotherhood of Evil Mutants [Mastermind; Magneto; Toad; Quicksilver [Pietro Maximoff]; Scarlet Witch[Wanda Maximoff] |
| 11 | The Brotherhood of Evil Mutants! | comic story | 23 | script: Stan Lee; pencils: Jack Kirby; inks: Paul Reinman; letters: Artie Simek | The X-Men [Professor X [Professor Charles Xavier]; The Angel [Warren Worthington}; The Beast [Hank McCoy]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Iceman [Bobby Drake]]; The Brotherhood of Evil Mutants [Mastermind; Magneto; Toad; Quicksilver [Pietro Maximoff]; Scarlet Witch [Wanda Maximoff |
| 12 | The Angel Is Trapped! | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Paul Reinman, Marie Severin; letters: Artie Simek | X-Men [Angel [Warren Worthington]; Beast [Hank McCoy]; Cyclops [Scott Summers]; Iceman [Bobby Drake]; Marvel Girl [Jean Grey]]; The Brotherhood of Evil Mutants [Magneto; Toad; Quicksilver [Pietro Maximoff]; Scarlet Witch [Wanda Maximoff]; Mastermind] |
| 13 | Trapped: One X-Man! | comic story | 24 | script: Stan Lee; pencils: Jack Kirby; inks: Paul Reinman; letters: S. Rosen | X-Men [Professor X [Professor Charles Xavier; Angel [Warren Worthington]; Beast [Hank McCoy]; Cyclops [Scott Summers]; Iceman [Bobby Drake]; Marvel Girl [Jean Grey]]; John Grey; Elaine Grey; The Brotherhood of Evil Mutants [Magneto; Toad; Quicksilver [Pietro Maximoff]; Scarlet Witch [Wanda Maximoff] |
| 14 | Sub-Mariner Joins the Evil Mutants! | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Chic Stone; letters: Artie Simek | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Iceman; Beast]; The Brotherhood of Evil Mutants [Mastermind; Magneto; Toad; Quicksilver; Scarlet Witch]; Namor, the Sub-Mariner |
| 15 | Sub-Mariner! Joins the Evil Mutants | comic story | 22 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; letters: Sam Rosen | The X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; The Brotherhood of Evil Mutants [Mastermind; Magneto; Toad; Quicksilver [Pietro Maximoff]; Scarlet Witch [Wanda Maximoff]]; Namor, the Sub |
| 16 | The Return of the Blob! | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Chic Stone; letters: Artie Simek | The X-Men [Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Brotherhood of Evil Mutants [Magneto; Quicksilver; Scarlet Witch; Mastermind; Toad]; Blob |
| 17 | The Return of the Blob | comic story | 22 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; letters: Art Simek | The X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington]; Beast [Hank McCoy]; Iceman [Bobby Drake]]; Brotherhood of Evil Mutants [Magneto; Quicksilver [Pietro Maximoff]; Scarlet Witch [Wanda Maximoff]; Mastermind; Toad]; Blob; Zelda; Berna |
| 18 | The Uncanny Threat of... Unus the Untouchable! | cover reprint (on interior page) | 1 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; letters: Sam Rosen | The X-Men [Angel [Warren Worthington III]; Cyclops [Scott Summers]; Beast [Hank McCoy]; Marvel Girl [Jean Grey]; Iceman [Bobby Drake]]; Unus [Gunther Bain] |
| 19 | The Uncanny Threat of... Unus the Untouchable! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; letters: S. Rosen | The X-Men [Angel [Warren Worthington III]; Marvel Girl [Jean Grey]; Beast [Hank McCoy]; Iceman [Bobby Drake]; Cyclops [Scott Summers]; Professor-X [Charles Xavier]]; Unus [Gunther Bain] (first appearance); Tommy (first appearance); Maxie (first appearance); Mastermind [Jason Wyngarde]; Charlie (firs |
| 20 | Guest-Starring: The Mighty Avengers | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Chic Stone; letters: Sam Rosen | The X-Men [Professor X; The Angel; The Beast; Cyclops; Marvel Girl [Jean Grey]; Iceman]; The Avengers [Giant-Man [Hank Pym]; Thor; Captain America; Iron Man]; Lucifer |
| 21 | Enter, The Avengers! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; letters: S. Rosen | The X-Men [Professor X [Charles Xavier]; The Angel [Warren Worthington]; The Beast [Hank McCoy]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Iceman [Bobby Drake]]; The Avengers [Giant-Man [Hank Pym]; Thor [Don Blake]; Captain America [Steve Rogers]; Iron Man [Tony Stark]; Wasp [Janet Van Dyne] |
| 22 | Introducing: Ka-Zar, Lord of the Jungle! | cover reprint (on interior page) | 1 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; letters: Sam Rosen, Artie Simek | The X-Men [Angel [Warren Worthington III]; Iceman [Bobby Drake]; Marvel Girl [Jean Grey]; Cyclops [Scott Summers]; Beast [Hank McCoy]]; Ka-Zar [Kevin Plunder]; Zabu |
| 23 | The Coming of... Ka-Zar! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; letters: S. Rosen | X-Men [Angel [Warren Worthington III]; Iceman [Bobby Drake]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Beast [Hank McCoy]; Professor-X [Charles Xavier]]; Ka-Zar [Kevin Plunder] (first appearance); Zabu (first appearance); Maa-Gor (first appearance); Swamp Men (first appearance) |
| 24 | Introducing The Stranger | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Chic Stone; letters: Sam Rosen | The X-Men [Professor X [Charles Xavier]; Angel [Warren Worthington III]; Cyclops [Scott Summers]; Iceman [Bobby Drake]; Beast [Hank McCoy]; Marvel Girl [Jean Grey]]; The Stranger |
| 25 | The Triumph of Magneto! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby; inks: Chic Stone; letters: Artie Simek | The X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Angel [Warren Worthington III]; Beast [Hank McCoy]]; Marvel Girl [Jean Grey]; Iceman [Bobby Drake]]; The Stranger (first appearance); Brotherhood of Evil Mutants [Magneto; Mastermind; Toad; Quicksilver [Pietro Maximoff]; Scarlet Witch |
| 26 | The Origin of Professor X! | cover reprint (on interior page) | 1 | script: Stan Lee; pencils: Jack Kirby; inks: Frank Giacoia; letters: Sam Rosen | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Juggernaut |
| 27 | The Origin of Professor X! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby, Alex Toth; inks: Vince Colletta; letters: Sam Rosen | The X-Men [Professor X [Charles Xavier] (origin); Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington]; Beast [Hank McCoy]; Iceman [Bobby Drake]]; Juggernaut [Cain Marko] (first appearance, origin); Kurt Marko (flashback); Sharon Xavier (Professor X's mother, flashback) |
| 28 | Where Walks the Juggernaut! | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Joe Sinnott; letters: Sam Rosen | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; The Human Torch [Johnny Storm]; Juggernaut [Cain Marko] |
| 29 | Where Walks the Juggernaut! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby, Jay Gavin; inks: Joe Sinnott; letters: Sam Rosen | The X-Men [Professor X [Charles Xavier]; Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington]; Beast [Hank McCoy]; Iceman [Bobby Drake]]; Juggernaut [Cain Marko]; Human Torch [Johnny Storm]; Teen Brigade; Matt Murdock |
| 30 | Among Us Stalk...The Sentinels! | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Wally Wood; letters: Sam Rosen | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Sentinels |
| 31 | Among Us Stalk...The Sentinels! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby, Jay Gavin; inks: V. Colletta; letters: Artie Simek | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Sentinels (introduction); Dr. Bolivar Trask (introduction); Zelda; Mr. Worthington; Mrs. Worthington |
| 32 | - | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Dick Ayers; letters: Sam Rosen | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Sentinels |
| 33 | Prisoners of the Mysterious Master Mold! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby, Jay Gavin; inks: Dick Ayers; letters: Artie Simek | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast (Origin); Iceman]; Sentinels; Master Mold; Dr. Bolivar Trask; Edna McCoy; Norton McCoy |
| 34 | The Supreme Sacrifice! | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Dick Ayers; letters: Sam Rosen | The X-Men [Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Master Mold |
| 35 | The Supreme Sacrifice! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby, Jay Gavin; inks: Dick Ayers; letters: Art Simek | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Sentinels; Master Mold; Dr. Bolivar Trask (Death) |
| 36 | - | cover reprint (on interior page) | 1 | script: Stan Lee; pencils: Jack Kirby; inks: Dick Ayers; letters: Sam Rosen | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Magneto's shadow |
| 37 | ...And None Shall Survive! | comic story | 20 | script: Stan Lee; pencils: Jack Kirby, Jack Kirby, Jay Gavin; inks: Dick Ayers; letters: Artie Simek | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Magneto; Mr. Worthington; Mrs. Worthington |
| 38 | If Iceman Should Fail! | cover reprint (on interior page) | 1 | pencils: Werner Roth, Jack Kirby; inks: Sol Brodsky; letters: Sam Rosen | Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman; Magneto |
| 39 | If Iceman Should Fail--! | comic story | 20 | script: Stan Lee; pencils: Jay Gavin; inks: Dick Ayers; letters: Artie Simek | X-Men [Professor X; Cyclops; Jean Grey; Angel; Beast; Iceman]; Mr. Worthington; Mrs. Worthington; Magneto (villain); Toad (villain); Stranger (cameo) |
| 40 | - | cover reprint (on interior page) | 1 | script: Stan Lee; pencils: Werner Roth, Marie Severin; inks: Marie Severin, Dick Ayers; letters: Sam Rosen | X-Men [Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Mimic |
| 41 | Lo! Now Shall Appear--The Mimic! | comic story | 20 | script: Stan Lee; pencils: Jay Gavin; inks: Dick Ayers; letters: Artie Simek | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast; Iceman]; Zelda; Vera (first appearance); Mimic [Calvin Rankin] (villain, first appearance, origin) |
| 42 | - | cover reprint (on interior page) | 1 | pencils: Werner Roth; inks: Dick Ayers; letters: Sam Rosen | The X-Men [Professor X; Cyclops; Marvel Girl; Angel; Beast; Iceman]; Lucifer; The Blob; Unus |
| 43 | I, Lucifer... | comic story | 20 | script: Roy Thomas; pencils: Jay Gavin; inks: Dick Ayers; letters: Artie Simek | The X-Men [Professor X; Cyclops; Marvel Girl; Angel; Beast; Iceman]; V: Lucifer; the Blob; Unus; The Supreme One |
| 44 | - | cover reprint (on interior page) | 1 | pencils: Werner Roth; inks: Dick Ayers | The X-Men [Professor X; Cyclops; Marvel Girl; Angel; Beast; Iceman]; Lucifer |
| 45 | From Whence Comes... Dominus? | comic story | 20 | script: Roy Thomas; pencils: Jay Gavin; inks: Dick Ayers; letters: Artie Simek | The X-Men [Professor X; Cyclops; Marvel Girl; Angel; Beast; Iceman]; Lucifer; the Supreme One |
| 46 | Divided We Fall! | cover reprint (on interior page) | 1 | pencils: Werner Roth; inks: Dick Ayers; 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 |
| 47 | 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]; Zelda; Vera; Count Nefaria (villain); Maggia (villain); Eel [Leopold Stryke] (villain); Porcupine (villain); Unicorn (villain); Scarecrow (villain); Plant Man (villain) |
| 48 | To Save A City! | cover reprint (on interior page) | 1 | pencils: Werner Roth; inks: Dick Ayers; letters: Sam Rosen | X-Men [Cyclops; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Beast; Iceman]; Eel [Leopold Stryke]; Porcupine; Plant Man; Unicorn; Scarecrow |
| 49 | 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 |
| 50 | The Plague Of The Locust! | cover reprint (on interior page) | 1 | pencils: Werner Roth; inks: Dick Ayers; letters: Sam Rosen | The X-Men [Cyclops; Marvel Girl; Angel; Beast; Iceman]; Locust [August Hopper] |
| 51 | 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] |
| 52 | Graphic Novels | promo (ad from the publisher) | 1 | pencils: various; inks: various; letters: typeset | X-Men |
| 53 | - | promo (ad from the publisher) | 1 | pencils: Bruce Timm; inks: Bruce Timm; colors: Marie Javins | The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; The Beast; The Angel; Iceman] |