X-Men #1 , published by Marvel Comics, featured the
first appearance of the mutan X-Men,
a team of young mutants led by Professor Charles Xavier
(Professor X). This issue introduced Professor X,
Cyclops, Beast, Iceman, Angel, and Marvel Girl. X-Men #1
also introduced Magneto as the villian.
The series was not very popular at first, and was
actually discontinued after X-Men #66. Marvel did
continue the series run with reprinted stories in issues
In 1975, the series was revived with the publication
of Giant-Size X-Men #1, which introduced a new team of
X-Men made up of Cyclops, Wolverine, Storm, Colossus ,
Nightcrawler, Thunderbird, Banshee, and Sunfire. Many of
the new members came from other nations (Wolverine from
Canada, Nightcrawler from Germany, and so on), and this
gave the X-Men a very multi-national flavor.
Giant-Size X-Men #1 acted as bridge between the
original X-Men and a new, more internationally-flavored
mutant team. Chronologically this important issue is
placed before The Uncanny X-Men #94 in the comic book
series. Giant-Size X-Men #1 is a 68-page issue published
with a May 1975 cover date but distributed to newsstands
in February of 1975.
Following the introduction of the new X-Men team,
sales of the series increased. In fact, Wolverine soon
became a very popular Marvel character, eventually
earning his own series in 1988.
From issue # 1 through issue #49, the series was
titled "The X-Men," and was called "The X-Men" from issue
# 50 through # 113. Beginning with issue # 114 through #
393, the series was titled "The Uncanny X-Men," and from
issue # 394 to today, simply called "Uncanny X-Men."
Regardless of the exact title, the X-Men/Uncanny X-Men is
Marvel's longest running series to maintain the original
numbering from the first issue to the present day.
In June, 2011, Marvel announced that as of issue #544
(to be released in February of 2012), the Uncany X-Men
series will end due to a plotline called "Schism," in
which the team is split up. This will apparantly end this
comic book series' numbering continuity.