Who's the sleeper agent? SPOILERS

[JDC001]

Going by History and since Sinister's the provider of this I am going with Gambit.

Though I think this is a stupid ass plot point regardless of who the mole is.

Two Words: Xmen Forever.

tsk tsk tsk

[Havok83]

Maybe the file was Quicksilver and this will be used to undo the retcon. Tony said it came from the X-database and maybe Sinister had him categorized under there bc of his connection to Magneto and/or X-Factor. If this revelation is tied to him, that could get them to prompt another look into his genetics to confirm that he is in fact a mutant

[mikeb]

Two Words: Xmen Forever.

tsk tsk tsk

Three words: X-Men The End.

[Sutekh]

There is no mole. Sinister just planted that little nugget of misinformation (and a few others...) in his files to mess with anyone who hacked him.

If the X-Men tear each other apart looking for an imaginary mole, and go all j'accuse and don't trust each other, well, that's just icing on the cake.

[Triniking1234]

It's someone who didn't make it into the Uncanny X-Men Disassembled teaser which means it's...

*spins a roulette*

Pyro II

Sucks to suck.

[Jesse-James]

It's someone who didn't make it into the Uncanny X-Men Disassembled teaser which means it's...

*spins a roulette*

Pyro II

Sucks to suck.

There is one X-Men character with a red stone on his forehead..... and he's also not on that cover.
Now would that not explain how he got that red diamond there?
Just contributing to wild speculation.

[Maniacal]

for story reasons... I'd want it to be:

Beast - which is why his body keeps changing with his experiments... unstable.
Rachel - Sinister's insistence on the Summers/Grey DNA... and then Rachel returned. The Phoenix also didn't run back to her...
Pyro II - would add some spice to Iceman's story, but is it shocking?

As for who I wouldn't want:
Gambit - makes too much sense... Not shocking enough.
Psylocke - with whats going on with her... too easy of a twist. Not shocking enough.
Hope - you'd think the Phoenix force would see that... when it came for her. Could be shocking.
Firestar - was first recruited by Emma Frost and became a Hellion. Sinister would have to wait a long time to infiltrate the Xmen considering she was technically a rival. Is it shocking enough? Or just confusing?
Storm - just stop messing with her... vampire, de-aged mutate, hammer-wielder, goddess, avenger... meh.
Banshee - would be... not interesting enough of a story.

[Marvelboy1974]

Just don't let it be adult Jean Grey. What a slap in the face it would be to her fans.
Storm: Been there done that in X-men Forever: epic fail
Rachel: unfortunately would make sense after the way she has been treated as of late
Gambit: too predictable
Hope: That would be shocking and Bishop's reasons for trying to kill her would make sense
Nightcrawler: It wouldn't make any sense
Iceman: same as Nightcrawler
Kitty: Now that would be the shocker right there

[Marvelboy1974]

Just don't let it be adult Jean Grey. What a slap in the face it would be to her fans.
Storm: Been there done that in X-men Forever: epic fail
Rachel: unfortunately would make sense after the way she has been treated as of late
Gambit: too predictable
Hope: That would be shocking and Bishop's reasons for trying to kill her would make sense
Nightcrawler: It wouldn't make any sense
Iceman: same as Nightcrawler
Kitty: Now that would be the shocker right there

[razzmatazz360]

the mole was Threnody

[DDM]

Two longtime characters with a story rationale I could see:

Psylocke: Her twin brother isn’t a mutant, she and her siblings may have been bioengineered at Merlyn’s request, psychic abilities aren’t unusual among Otherworlders (which her father was one), her joining the X-Men was revealed to have been manipulated by Roma in order to ensure Excalibur’s formation, put these things together and there’s a solid case Betsy could not be a mutant but may have been made to appear one to further Merlyn and Roma’s plans.

Rachel: This one’s iffier but if they went ahead with Claremont’s original intended origin for her she’s essentially a (baby) cosmic force thinking it’s a human. There also a dangler from way back where Moira noticed something unusual and alarming in Rachel’s DNA that was never revealed.

[WhiteQueenEmmaFrost]

the mole was Threnody

that makes sense since she worked for sinister (was his captive). She's back again in Deadpool.

[SonOfPsylocke]

The next person who says Psylocke, I am going to get the admins involved.

[DDM]

The next person who says Psylocke, I am going to get the admins involved.

What if I say Spylocke?

[SonOfPsylocke]

What if I say Spylocke?

Do not, Sharif! Or there will be darknessatnoon.