Clicking on the eBay link and making a purchase may result in this site earning a commission from the eBay Partner Network.

Marvel ⋅ 1963

Low
$6.2k
Mid
$14k
High
$85k

Key Facts

1st team appearance of the X-Men: Cyclops, Jean Grey aka Marvel Girl, Iceman, Angel, Beast, Professor X

1st appearance of Magneto

Homo Superior concept, coined by Magneto to describe humans born with special abilities introduced in this issue

Marvel ⋅ 1964

Low
$110
Mid
$425
High
$1.9k

Key Facts

1st appearance of the Blob, an invulnerable mutant

Marvel ⋅ 1964

Low
$525
Mid
$2.1k
High
$10.5k

Key Facts

1st team appearance of the Brotherhood of Evil Mutants led by Magneto

1st appearance of Scarlet Witch

1st appearance of Quicksilver

1st appearance Mastermind, later becomes Jason Wyngarde

1st appearance of Toad

2nd appearance of Magneto

Although the Scarlet Witch's costume is colored green on the cover, it is red in the story

[December 2023 - a Brotherhood of Mutants projects is rumored to be in discussion for the MCU slate]

Marvel ⋅ 1965

Low
$240
Mid
$900
High
$3.3k

Key Facts

1st appearance and origin of the Juggernaut

Origin of Professor X

1st cameo appearance of Cyttorak, as a statue, the demonic elder god whose Crimson Bands and ruby gemstone gave Juggernaut great powers

Marvel ⋅ 1965

Low
$150
Mid
$500
High
$1.5k

Key Facts

1st appearance of the Sentinels, machines invented to hunt mutants

1st appearance of Dr. Bolivar Trask, creator of the Sentinels

Low
$80
Mid
$200
High
$800

Key Facts

Debut of new powers, Jean Grey is reborn as the Phoenix

Ten years later this moment would be further developed where the Phoenix is an actual cosmic entity of vast power that copied Grey’s physical form while placing her body in a cocoon to heal from her injuries

1st full appearance of Black Tom Cassidy

Marvel ⋅ 1978

Low
$15
Mid
$50
High
$150

Key Facts

1st full appearance of Mystique, revealed without disguise

[April 2021 - when keying in a number sequence on the Buccaneer Bay section of Marvel’s exploremadripoor.com, an image with the name Mystique appears in a boat charter reservation]

Low
$8
Mid
$20
High
$80

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

Low
$8
Mid
$20
High
$85

Key Facts

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

Low
$50
Mid
$125
High
$350

Key Facts

The Dark Phoenix Saga Part 1

1st appearance of Kitty Pryde

1st appearance of Emma Frost, the White Queen

1st cameo team appearance of The Hellfire Club, in shadows

Low
$9
Mid
$30
High
$100

Key Facts

The Dark Phoenix Saga Part 6

Jean Grey becomes the Dark Phoenix

Low
$3
Mid
$9
High
$30

Key Facts

"God Loves, Man Kills"

1st appearance of General William Stryker

1st team appearance of the Purifiers

1st appearance of Kitty Pryde as Ariel, formerly Sprite - new costume debut occurred in Uncanny X-Men #169

Marvel ⋅ 1986

Low
$5
Mid
$18
High
$65

Key Facts

1st full appearance and cover of Apocalypse

Low
$5
Mid
$15
High
$75

Key Facts

1st full appearance of Mr. Sinister

[July 2022 - Javier Bardem rumored to be cast as Mr. Sinister in an unknown MCU project]

Marvel ⋅ 1990

Low
$10
Mid
$30
High
$100

Key Facts

1st full appearance of Cable

1st full team appearance of the Mutant Liberation Front: Stryfe, Wildside, Reaper, Fourarm, Thumbelina, Strobe, Tempo, Zero

Marvel ⋅ 1996

Low
$2
Mid
$8
High
$25

Key Facts

1st full appearance of Onslaught, a creation born from the mind of Charles X and Magneto

Adjust Your Filters To See More Comics!

By default Key Collector searches for Standard Cover Key Issues.

Adjust the "Variants" search filter above for additional content:

  • Variant Covers ([[totalVariants]])

At Key Collector, our primary focus is on unearthing those rare Standard Cover Key Issues for you. However, the world of comic collectibles is vast and varied. We want to make sure you have the tools to explore it all!