Of all the characters we haven’t seen in any of the promos that are apparently going to show up in the movie itself, including at least one female character who will have a role in driving the plot(Whedon said last summer there’d be four such roles, and we can only account for three in the announced cast), I’m seriously wondering if Sharon Carter will be one of them, or if we will wait until Civil War to see her again. Although if her Aunt dies in this one, there might be a cameo related to that. Or if she might even show up in Agents of S.H.I.E.L.D.
But I would expect her to be become important by Civil War at the latest. Especially considering the fate we saw her come to at the end of Winter Soldier. Because anyone who knows anything about the C.I.A. will know her decision to join them is odd indeed.
After all, it is pretty much accepted fact, even by pro-C.I.A. movies such as Argo, that for decades the C.I.A. has been involved in doing many things to wreck havoc in other countries and make their inhabitants miserable, much in the way that Hydra was apparently doing in the MCU. Of course the MCU version of the C.I.A. might not have been doing as much of that, leaving that kind of work to S.H.I.E.L.D., but that seems unlikely, considering S.H.I.E.L.D. isn’t bound to serve the U.S. government first the way the C.I.A. is. It seems more likely Hydra was involved in the C.I.A. They might have even been the ones pulling the strings in the organization from the start of its Cold War rise, which would make a hell of a lot of sense. Which means that will S.H.I.E.L.D. down, Hydra would probably want to use the C.I.A. to pull of far more of their nefarious schemes. But even if the C.I.A. actually is not run by Hydra, but is it’s own organization doing it’s own thing, there’s no way Hydra still hasn’t planted someone in there, and probably high up, just to make sure that organization’s activities didn’t hinder Hydra’s.
Which first brings up the question of what the hell was Sharon thinking, joining such an organization? But to the answer to that’s obvious enough: she wasn’t joining it to join it. She was probably joining it to infiltrate it.
After all, surely Fury would realize all this about the C.I.A., and if he was planning to head off to Europe so quickly, he probably wanted someone working on that immediately, someone who had been low-profile enough(Sharon might have even applied with a fake resume) that her superiors wouldn’t be suspicious of her. Sharon Carter was on hand, her loyalty was beyond doubt thanks to her actions at the Triskelion, and she was someone who had experience at subterfuge. She’s probably under instructions to discover what connections to Hydra they have, and report back to him, or possibly to Coulson, maybe with permission to kill or otherwise take down any Hydra people if she judges that the best course of action.
That sort of mission, of course, is something that fits far more with the the story of the Civil War than the story of Ultron. But I wouldn’t be surprised if she showed up anyway at some point, maybe to give our heroes some help, maybe not even necessarily with her true mission yet revealed.
Once the U.S. government finds out, of course, that Nick Fury sent such a spy into an organization they run, the consequences would be explosive, especially if it happens against the backdrop of the Civil War already underway. So whether she shows up on screen before the next Captain America movie or not, if I’m right, she will play a huge part there. Which is good, given how underused she was in Winter Soldier. There it seemed there wasn’t really room for her, until you wondered why they bothered introduce her. It could very well be they did just so they could plant yet another seed of events to come in that movie’s final sequence.