Marvel Comics has big things planned for its X-Men franchise this fall, and it all begins with the return of Uncanny X-Men #1. After a hiatus, the flagship X-title will kick off its run with a 10-part weekly storyline titled "Disassembled," from the creative team of writers Ed Brisson, Kelly Thompson and Matthew Rosenberg, and artists Mahmud Asrar, R.B. Silva, Yildiray Cinar and Pere Perez.

The first "Disassembled" teaser trailer by artists David Marquez and Rachelle Rosenberg gives a glimpse at the cast Marvel plans on using, and it features just about every major and minor X-Man in existence. Of course, hardcore fans can spot and name every single mutant displayed, from the obvious characters that have been around for decades like Jean Grey down to the newer, younger mutants.

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But once you give the teaser a closer inspection, it becomes obvious that some pretty important X-Men are missing in action. While we don't know the reason for the absences, we can assume it either boils down to Marvel choosing to keep their appearances as a surprise for the Uncanny X-Men story, or the characters not being alive or around to join in the festivities.

We've taken the liberty of listing some of the major X-Men missing from the Uncanny X-Men "Disassembled" teaser, making sure to focus on the mutants fans will and should expect to show up during the event. Also, since the image makes sure to leave any villains out, you won't find Magneto or Emma Frost in our rundown.

Professor Charles Xavier aka X

The first of our newly-resurrected-and-missing mutants is the man who founded the X-Men, Professor Charles Xavier. After dying at the hands of a Phoenix-powered Cyclops in Avengers vs. X-Men, Xavier's soul was lost in the astral plane, where he was forced to do battle with the Shadow King.

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Writer Charles Soule and a bevy of artists brought Professor X back from the dead in Astonishing X-Men, but with an interesting twist: Fantomex agreed to switch places with Xavier and stay behind in the astral plane, allowing Professor X's consciousness to inhabit Fantomex's body. So Charles Xavier is back and going by the name of X, but his personality isn't the same as when he was initially alive. It's unclear if Fantomex's personality is rubbing off on Xavier, but right now he hasn't proved himself to be totally trustworthy, even going so far as to erase the minds of the Astonishing X-Men team so they would forget he has returned.

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X-Men Blue

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There is a pretty good reason for the Original Five members of X-Men Blue (Marvel Girl, Cyclops, Beast, Angel and Iceman) to be absent from the "Disassembled" teaser, and it has everything to do with Extermination, which launched this week. The selling point for the event is to return the time-displaced X-Men back to their proper place in the past, with them gone they wouldn't be able to star in Uncanny X-Men.

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Of course, Marvel has added some extra members to X-Men Blue aside from the Original Five, with the Ultimate Universe's Jimmy Hudson and Bloodstorm joining their ranks. Jimmy recently bonded with a Poison symbiote following the Venomized weekly series and left the team, and Bloodstorm was one of the fatalities in the first chapter of Extermination.

Cable

Speaking of Extermination, Cable played a major role in the first issue as another fatality and as the mystery character looking to fix the fractured timeline. If Cable's death in Extermination sticks, then it would explain his Uncanny X-Men absence.

But we also have to wonder if Marvel will leave Cable dead for long. The time-traveling mutant just made his big screen debut in Deadpool 2, played by Josh Brolin, so it doesn't seem like the most opportune time to remove him from Marvel's publishing slate. Also, the teaser has two other time-travelers standing with the X-Men (Prestige and Bishop), so it just makes the lack of Cable all the more glaring.

Namor

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The King of Atlantis has been an on-again/off-again member of the X-Men over the last several years, but he recently joined Jean Grey's X-Men Red team, while also providing their undersea base, Searebro.

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The entire X-Men Red team (Jean Grey, Nightcrawler, X-23, Honey Badger, Storm, Gambit, Gentle and Trinary) appear in the teaser, except for Namor. Perhaps the king is too busy ruling over his underwater kingdom to get involved, but it does make us wonder if there is a larger reason at play here.

Old Man Logan

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Old Man Logan made his way to the Marvel Prime Universe following the end of Secret Wars, and would finally settle down with a second chance at a slightly happier life after everything that happened to him in his universe. However, Marvel has made no secret that his time is running out -- first with the announcement that his series will end in October, and then this week's reveal of a Dead Man Logan 12-issue limited series teasing the older Wolverine's death.

Dead Man Logan and Uncanny X-Men will be released at the same time, so with the former serving as a final swan song for Old Man Logan, it doesn't make much sense to include him in Uncanny X-Men -- unless Marvel wanted to kill him in the weekly series, of course. Plus, Marvel has promised a few deaths in "Disassembled," which means Old Man Logan perishing there could have been used as shock value to the readers.

Wolverine

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Last but not least is the original Wolverine, back from the dead and lurking in the Marvel Universe shadows. Wolverine made his surprise return in last year's Marvel Legacy #1, with his story continuing in the Hunt For Wolverine one-shot and a Return of Wolverine miniseries.

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Wolverine can be considered the most popular X-Man of all time, so knowing he's alive again and not taking a part in Uncanny X-Men's "Disassembled" is disappointing. But just like with Old Man Logan, having Uncanny X-Men and Return of Wolverine running at roughly the same time means one story can't conflict with the other, so the choice was made to keep the two apart -- at least for now. However, we'd wager it won't be long before Wolverine -- and his new hot claws -- shows his face in Uncanny X-Men post-"Disassembled."