Giant-Size X-Men #1 was a special issue of the X-Men comic book series, published by Marvel Comics in 1975. It was written by Len Wein and illustrated by Dave Cockrum. Though not a regular issue, it contained the first new X-Men story in five years, titled Second Genesis. The issue serves as a link between the original X-Men and a new team. Chronologically it is placed after X-Men #66 and before X-Men #94. The 68-page book was published with a May 1975 cover date and distributed to newsstands in February of that year.
The X-Men title stopped producing new stories after #66 in March 1970. From December 1970 through April 1975, Marvel reprinted many of the older X-Men issues as #67–93. Following the May publication of Giant-Size X-Men #1, Marvel began again publishing new issues of X-Men with #94 in August 1975.
The comic also collects reprints from X-Men #43, #47 and #57.
The story opens in medias res, with Professor X recruiting a new team of X-Men, to rescue the original X-Men (Marvel Girl, Iceman and Angel [but not Beast, who had left the team], plus X-Men recruits Havok and Polaris), who had disappeared on a mission to the island of Krakoa, with only their leader Cyclops escaping. The new team consists of Sunfire and Banshee, who had been introduced in earlier X-Men comics; Wolverine, who had made his first appearance in The Incredible Hulk #181 (Oct. 1974); and the newly created Storm, Nightcrawler, Colossus, and Thunderbird. These members are gathered from all over the world, and Professor X uses his telepathic powers to teach them all English so that they can communicate with each other.
The team soon learns that Krakoa is not just an island, but a giant mutant as well. Despite a number of personality clashes among the individual members, the new team succeeds in rescuing the old X-Men as well as destroying the island by shooting it into outer space with Polaris' power. The issue ends by posing the question of the future of a 13-member X-Men team.
The later storyline "Deadly Genesis" offers a ret-con of this story, which tells how Professor X had initially recruited a different team before the events in the title who failed.
The "Second Genesis" story was reprinted in Classic X-Men #1 in September 1986, with substantial editing to reduce its length, and a new backup story by Claremont and John Bolton bridging the gap between this and the following issue, Uncanny X-Men #94.
Marvel published a second issue of Giant-Size X-Men later in 1975. This November issue had no new material, instead featuring reprints of stories from X-Men #57, #58, and #59, written by Roy Thomas and illustrated by Neal Adams.
In 2005, Marvel published two new Giant Size X-Men issues to celebrate the 30th anniversary of the original. Issue #3 in July contained a story written by Joss Whedon and illustrated by Neal Adams. The issue also reprinted several older X-Men team-ups: the group's appearance in Fantastic Four #28, an Avengers guest appearance in X-Men #9 and a story featuring Spider-Man in X-Men #35. In November, Chris Claremont penned a story for issue #4, with artwork by Adams. It also reprinted material related to the death of Thunderbird from X-Men #94-95, Classic X-Men #3 and Uncanny X-Men #193.
Five Giant Size X-Men one-shots, all written by Jonathan Hickman, were released as part of Marvel's 2019 Dawn of X relaunch of its X-Men books between February and September 2020. The first, Giant Size X-Men: Jean Grey and Emma Frost, was drawn by Russell Dauterman and colored by Matt Wilson. The second, Giant-Size X-Men: Nightcrawler, was drawn by Alan Davis and colored by Carlos Lopez. The third, Giant-Size X-Men: Magneto, was drawn by Ramon Perez and colored by David Curiel. The fourth, Giant-Size X-Men: Fantomex, was drawn and colored by Rod Reis. The fifth, Giant-Size X-Men: Storm, was drawn by Dauterman and colored by Wilson.
|Issue||Publication date||Writer||Artist||Colorist||Comic Book Roundup rating||Estimated sales to North American retailers (first month)|
|Giant Size X-Men: Jean Grey and Emma Frost||February 26, 2020||Jonathan Hickman||Russell Dauterman||Matt Wilson||8.6 by 19 professional critics||63,077|
|Giant-Size X-Men: Nightcrawler||March 25, 2020||Alan Davis||Carlos Lopez||7.5 by 16 professional critics||46,861|
|Giant-Size X-Men: Magneto||July 15, 2020||Ramon Perez||David Curiel||7.7 by 13 professional critics||Data not yet available|
|Giant-Size X-Men: Fantomex||August 5, 2020||Rod Reis||8.2 by 7 professional critics|
|Giant-Size X-Men: Storm||September 16, 2020||Russell Dauterman||Matt Wilson||8.7 by 12 professional critics|