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$8
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$20
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$80

Key Facts

1st appearance of the Entity, the dark side of Professor X

There are similarities between the Entity and Onslaught although the Entity is Xavier's dark side while Onslaught is the manifestation of Xavier and Magento's dark sides

Price Variant ⋅ Marvel ⋅ 1977

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$15
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$50
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$150

Key Facts

$0.35 price variant

Mark Jewelers ⋅ Marvel ⋅ 1977

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$18
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$180

Key Facts

1st full team appearance of the Starjammers: Corsair, Ch'od, Hepzibah, Raza, Cr'reee

Debut of Wolverine's Fang costume

1st team appearance of the Shi'ar Imperial Guard: Electron, Fang, Hobgoblin, Smasher, Quasar, Starbolt, Tempest, Scintilla, Titan, Vril-Rokk, Magic, Mentor, Nightside, Oracle, Impulse

1st appearance of the M'Krann Crystal

1st appearance of Gladiator, leader of the Imperial Guard

1st full appearance of D'Ken Neramani, a Shi’ar royal

Price Variant ⋅ Marvel ⋅ 1977

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$90
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$300
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$900

Key Facts

$0.35 price variant

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$9
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$30
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$100

Key Facts

First John Byrne artwork on the X-Men title

Collaboration of Claremont and Byrne begins and runs through issue #143

UK Edition ⋅ Marvel ⋅ 1977

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Key Facts

1st appearance of Weapon Alpha, becomes Vindicator in X-Men #120

UK Edition ⋅ Marvel ⋅ 1978

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Marvel ⋅ 1978

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$25

UK Edition ⋅ Marvel ⋅ 1978

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$2
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$8
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$25

Marvel ⋅ 1978

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$5
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$15
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$50

UK Edition ⋅ Marvel ⋅ 1978

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$2
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$8
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$25
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$8
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$20
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$85

Key Facts

Classic cover art by George Perez

UK Edition ⋅ Marvel ⋅ 1978

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$15
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$50

Marvel ⋅ 1978

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$5
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$12
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$40

UK Edition ⋅ Marvel ⋅ 1978

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$2
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$8
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$25
Low
$8
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$20
High
$75

Key Facts

First time the word ‘Uncanny’ appears above ‘X-Men’ but the title didn't officially become ‘Uncanny X-Men’ until #142

UK Edition ⋅ Marvel ⋅ 1978

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$10
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$30

Marvel ⋅ 1978

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$5
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$18
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$55

UK Edition ⋅ Marvel ⋅ 1978

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$2
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$8
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$20
Low
$5
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$18
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$65

Key Facts

Introduction of Wolverine's healing power though it is only hinted at

First time it is implied that Wolverine took a life of an enemy

UK Edition ⋅ Marvel ⋅ 1978

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Key Facts

Introduction of Wolverine's healing power though it is only hinted at

First time it is implied that Wolverine took a life of an enemy

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Key Facts

1st appearance of the Shadow King, Amahl Farouk, a powerful psychic

Origin of Professor X concerning a difficult psychic battle against Amahl Farouk which was the inspiration to create the X-Men

Professor X recalls his first encounter with Storm

UK Edition ⋅ Marvel ⋅ 1979

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$8
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Marvel Legends ⋅ Marvel ⋅ 1979

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$5
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$18
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$65

Key Facts

1st appearance of Mariko Yashida, Wolverine's now-deceased fiance

Whitman ⋅ Marvel ⋅ 1979

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Key Facts

Whitman edition, identified by a blank UPC box

UK Edition ⋅ Marvel ⋅ 1979

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$2
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$8
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$25

Key Facts

Cameo of Proteus, voice only

Insignia of a Golden Eagle award on the cover refers to a U.K. fan award for favorite dramatic comic book

UK Edition ⋅ Marvel ⋅ 1979

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$20
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$80
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$215

Key Facts

1st cameo team appearance of Alpha Flight: Sasquatch, Aurora, Northstar, Shaman, Snowbird

[June 2020 - Alpha Flight rumored to make an appearance in the MCU]

UK Edition ⋅ Marvel ⋅ 1979

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$8
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Low
$18
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$60
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$180

Key Facts

1st full team appearance of Alpha Flight: Aurora, Northstar, Sasquatch, Snowbird, Shaman, and Vindicator, formerly Weapon Alpha

Mark Jewelers ⋅ Marvel ⋅ 1979

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$140
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$5
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$15
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$55

Key Facts

Origin of Colossus

Mastermind assumes the physical identity of a Scottish man named Jason Wyngarde, an identity he kept for many years

Newsstand ⋅ Marvel ⋅ 1979

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Key Facts

Storm's nipple is exposed in a panel where she is blow-drying her hair

This was drawn into the panel by John Byrne but was not visible on the printed page until high-resolution digital technology became available

Newsstand ⋅ Marvel ⋅ 1979

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$15

UK Edition ⋅ Marvel ⋅ 1979

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Marvel ⋅ 1979

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$30

Key Facts

1st appearance of Colossus as The Proletarian

Newsstand ⋅ Marvel ⋅ 1979

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$35

UK Edition ⋅ Marvel ⋅ 1979

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$8
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$8
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$20
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$85

Key Facts

1st cameo appearance of Mutant X aka Proteus, the son of Moira MacTaggert

Cameo appearance of DC's Phantom Stranger and Popeye in the background art of a party hosted by Empress Lilandra

Newsstand ⋅ Marvel ⋅ 1979

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$50

UK Edition ⋅ Marvel ⋅ 1979

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$2
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$10
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$30
Low
$7
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$20
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$75

Key Facts

1st full appearance of Proteus, a featureless human shape composed of white light

Newsstand ⋅ Marvel ⋅ 1979

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$35

UK Edition ⋅ Marvel ⋅ 1979

Low
$2
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$8
High
$20

Marvel ⋅ 1979

Low
$2
Mid
$10
High
$30

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