Uncanny X-Men  (1963)

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Marvel ⋅ 1966

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Key Facts

1st appearance and origin of the Locust

Marvel ⋅ 1966

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1st cameo appearance of Kukulkan, a Mayan god

1st appearance and origin of El Tigre, a treasure hunter who was mutated by the Mystic Mists of the Savage Land which led to his suicide

Marvel ⋅ 1966

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Non-Key Issue. No additional information is available.

Marvel ⋅ 1966

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1st full appearance of Banshee, father of Siryn and cousin of Black Tom Cassidy

Reprint ⋅ Marvel ⋅ 1994

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Non-Key Issue. No additional information is available.

JC Penney ⋅ Marvel ⋅ 1994

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Reprint of X-Men #28 (1967), distributed by JC Penney department stores

Identified by the Stridex advertisement on the back cover

Marvel ⋅ 1966

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Non-Key Issue. No additional information is available.

Marvel ⋅ 1967

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Non-Key Issue. No additional information is available.

Marvel ⋅ 1967

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1st appearance of Cobalt Man, a former Stark employee who duplicated Iron Man tech for his own armor

1st appearance of Candy Southern, former girlfriend of Angel

Marvel ⋅ 1967

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Key Facts

3rd appearance of Juggernaut

Marvel ⋅ 1967

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Cover art featuring the Juggernaut

Original cover art featured Xorak the Outcast but was deemed too terrifying in accordance with the Comics Code Authority

Marvel ⋅ 1967

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Key Facts

Non-Key Issue. No additional information is available.

Marvel ⋅ 1967

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1st appearance of Changeling, later reintroduced as Morph in the alternate realities of the X-Men animated series and Exiles (2001)

2nd appearance of Banshee

Marvel ⋅ 1967

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1st appearance of Mekano, a villain whose strength is derived from an exo-skeleton suit

Marvel ⋅ 1967

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Key Facts

Non-Key Issue. No additional information is available.

Marvel ⋅ 1967

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Origin back-up stories begin featuring the X-Men and the creation of the team

Marvel ⋅ 1967

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Debut of new X-Men suits

Origin of Cyclops

Marvel ⋅ 1968

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Key Facts

Origin of Cyclops continued

Frankenstein's monster appearance, revealed to be an android created by aliens

Marvel ⋅ 1968

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1st appearance of Grotesk aka Gor-Tok

Origin of Cyclops continued

Marvel ⋅ 1968

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Death of Changeling, disguised as Professor X

Origin of Cyclops continued

Marvel ⋅ 1968

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Non-Key Issue. No additional information is available.

Marvel ⋅ 1968

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1st appearance of Red Raven in the Silver Age

Origin of Iceman, continued thru to #47

Marvel ⋅ 1968

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Non-Key Issue. No additional information is available.

Marvel ⋅ 1968

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Key Facts

Non-Key Issue. No additional information is available.

Marvel ⋅ 1968

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Key Facts

Non-Key Issue. No additional information is available.

Marvel ⋅ 1968

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Key Facts

Non-Key Issue. No additional information is available.

Marvel ⋅ 1968

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1st appearance of Lorna Dane, daughter of Magneto who later takes the name Polaris

1st appearance of Mesmero, a mutant with hypnosis powers

Origin of Beast begins and continues through to #53

Marvel ⋅ 1968

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Key Facts

2nd appearance Lorna Dane, daughter of Magneto who later takes the name Polaris

2nd appearance of Mesmero

Origin of Beast, his birth and cause of mutation

First use of the classic X-Men logo, designed by Jim Steranko

Marvel ⋅ 1968

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Cyclops disguised as Erik the Red

Iconic cover art by Jim Steranko

Marvel ⋅ 1969

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Key Facts

Cyclops disguised as Erik the Red

Marvel ⋅ 1969

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First professionally published cover art by Barry Windsor-Smith

Origin of Beast, back-up story concludes

Marvel ⋅ 1969

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Key Facts

1st appearance and origin of Alex Summers, later becomes Havok in X-Men #56

1st appearance of the Living Pharaoh, later becomes the Living Monolith

Origin of Angel

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Key Facts

Origin of Angel, as the Avenging Angel

UK Edition ⋅ Marvel ⋅ 1969

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Iconic cover art by Neal Adams

The Living Pharaoh becomes the Living Monolith, later becomes the Living Planet

Origin of Angel, joins the X-Men

UK Edition ⋅ Marvel ⋅ 1969

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1st appearance of Larry Trask, son of Bolivar Trask

UK Edition ⋅ Marvel ⋅ 1969

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1st appearance of Havok in costume

UK Edition ⋅ Marvel ⋅ 1969

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1st appearance of Dr. Lykos, the human form of Sauron

UK Edition ⋅ Marvel ⋅ 1969

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Non-Key Issue. No additional information is available.
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1st appearance of Sauron, a Savage Land mutate

Reprint ⋅ Marvel ⋅ 1993

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Key Facts

Non-Key Issue. No additional information is available.

UK Edition ⋅ Marvel ⋅ 1969

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2nd appearance of Sauron

UK Edition ⋅ Marvel ⋅ 1969

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Key Facts

Non-Key Issue. No additional information is available.

JC Penney ⋅ Marvel ⋅ 1993

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Key Facts

Reprint of X-Men #61, distributed by JC Penney department stores

Identified by the X-Men VHS advertisement on back cover

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Key Facts

1st team appearance of the Savage Land Mutates, natives of the Savage Land, genetically altered by Magneto

First time Magneto removes helmet

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