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X-Men Deadly Adversaries

Marvel Sep 1963

Uncanny X-Men #1

Uncanny X-Men #1
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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 Mar 1964

Uncanny X-Men #4

Uncanny X-Men #4
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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
First interaction between Charles Xavier and Magneto, though their origins have since been retconned to have them meet earlier in their lives
Marvel Jul 1965

Uncanny X-Men #12

Uncanny X-Men #12
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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 Oct 1976

Uncanny X-Men #101

Uncanny X-Men #101
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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 Jan 1979

Uncanny X-Men #117

Uncanny X-Men #117
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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
Marvel Sep 1979

Uncanny X-Men #125

Uncanny X-Men #125
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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
Marvel Jan 1980

Uncanny X-Men #129

Uncanny X-Men #129
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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
Marvel Nov 1982

Marvel Graphic Novel #5

Marvel Graphic Novel #5
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"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 Mar 1990

New Mutants #87

New Mutants #87
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1st full appearance of Cable
1st full team appearance of the Mutant Liberation Front: Stryfe, Wildside, Reaper, Fourarm, Thumbelina, Strobe, Tempo, Zero

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