X-Factor  (1986)

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X-Factor #6

Marvel 1986 Vol. 1
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1st full appearance and cover of Apocalypse

X-Factor #7

Marvel 1986 Vol. 1
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1st appearance of Skids, a mutant who can produce force fields

1st appearance of Bulk

1st appearance of Glow Worm

1st appearance of Trish Tilby, a reporter and ex-girlfriend of Beast

X-Factor #8

Marvel 1986 Vol. 1
Non-Key
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X-Factor #9

Marvel 1986 Vol. 1
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X-Factor #10

Marvel 1986 Vol. 1
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Specialty border printed on select covers published in November 1986 celebrating Marvel's 25th Anniversary or more precisely, the 25th year since Fantastic Four #1 was published in November 1961

2nd full appearance of Apocalypse

X-Factor #11

Marvel 1986 Vol. 1
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X-Factor #12

Marvel 1987 Vol. 1
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1st appearance of Autumn Rolfson, becomes Famine

X-Factor #13

Marvel 1987 Vol. 1
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X-Factor #14

Marvel 1987 Vol. 1
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X-Factor #15

Marvel 1987 Vol. 1
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Angel's wings amputated

1st partial team appearance of the Horsemen of Apocalypse: War, Famine, Pestilence

X-Factor #16

Marvel 1987 Vol. 1
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X-Factor #17

Marvel 1987 Vol. 1
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1st appearance of Rictor, a Mexican mutant with the ability to generate seismic energy

X-Factor #18

Marvel 1987 Vol. 1
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X-Factor #19

Marvel 1987 Vol. 1
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2nd cover appearance of Apocalypse

1st team cover appearance of the Horsemen of Apocalypse

X-Factor #20

Marvel 1987 Vol. 1
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X-Factor #21

Marvel 1987 Vol. 1
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1st cameo appearance of Angel as Death, a Horseman of Apocalypse

X-Factor #22

Marvel 1987 Vol. 1
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2nd cameo appearance of Angel as Death, a Horseman of Apocalypse

X-Factor #23

Marvel 1987 Vol. 1
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1st full team appearance of the Horsemen of Apocalypse: Death, Famine, War, Pestilence

1st full appearance of Angel as the Horseman Death, later named Archangel in X-Factor #38

⚠️ Debatable Firsts: Angel's first appearance as Archangel is often cited as X-Factor #24. The Horseman Death, formerly known as Angel, becomes Archangel in X-Factor #38

X-Factor #24

Marvel 1988 Vol. 1
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1st cover and second appearance of Angel as the Horseman, Death

In X-Factor #38, Beast gives Warren Worthington III the new codename Archangel

Worthington appears in full as the Horseman, Death in X-Factor #23 and in multiple cameos leading up to the issue

X-Factor #25

Marvel 1988 Vol. 1
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3rd full appearance of Angel as the Horseman Death

X-Factor #26

Marvel 1988 Vol. 1
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New X-Factor costume design

X-Factor #27

Marvel 1988 Vol. 1
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X-Factor #28

Marvel 1988 Vol. 1
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1st appearance of Infectia

X-Factor #29

Marvel 1988 Vol. 1
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X-Factor #30

Marvel 1988 Vol. 1
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1st cameo appearance of Nanny, an inventor contained in one of her own cybernetic designs

X-Factor #31

Marvel 1988 Vol. 1
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1st cameo appearance of Orphan Maker

X-Factor #33

Marvel 1988 Vol. 1
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1st full appearance of Orphan Maker

X-Factor #34

Marvel 1988 Vol. 1
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Death of Cameron Hodge

1st full appearance of Nanny

X-Factor #35

Marvel 1988 Vol. 1
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Origin of Cyclops

X-Factor #36

Marvel 1989 Vol. 1
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X-Factor #37

Marvel 1989 Vol. 1
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X-Factor #38

Marvel 1989 Vol. 1
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Origin and death of the Goblin Queen aka Madelyne Pryor

Warren Worthington, formerly Angel, then the Horseman Death, becomes Archangel, named by Beast

X-Factor #39

Marvel 1989 Vol. 1
Non-Key
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X-Factor #40

Marvel 1989 Vol. 1
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$3
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X-Factor #41

Marvel 1989 Vol. 1
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1st appearance of Alchemy

X-Factor #42

Marvel 1989 Vol. 1
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X-Factor #43

Marvel 1989 Vol. 1
Non-Key
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X-Factor #44

Marvel 1989 Vol. 1
Non-Key
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X-Factor #45

Marvel 1989 Vol. 1
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X-Factor #46

Marvel 1989 Vol. 1
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X-Factor #48

Marvel 1989 Vol. 1
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X-Factor #49

Marvel 1989 Vol. 1
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X-Factor #50

Marvel 1990 Vol. 1
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Todd McFarlane and Rob Liefeld cover art

X-Factor #51

Marvel 1990 Vol. 1
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1st appearance of Mole, a Morlock

X-Factor #52

Marvel 1990 Vol. 1
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X-Factor #53

Marvel 1990 Vol. 1
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X-Factor #54

Marvel 1990 Vol. 1
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1st appearance of Crimson

X-Factor #56

Marvel 1990 Vol. 1
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X-Factor #57

Marvel 1990 Vol. 1
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X-Factor #58

Marvel 1990 Vol. 1
Non-Key
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$3
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