The new issue of Captain Marvel got me thinking about it, and I know we've done this to death already, but here's my theory for who's a Skrull: The entire Astonishing X-Men cast. The real X-Men are all still out in space. Meanwhile, Skrullclops acts like a dick to Xavier during MC, "disbands" the X-Men, reestablishes X-Force, and previews for Young X-Men says he's ordering them to hunt and kill the new Brotherhood. Anyway, the X-Men Skrulls are all sleeper agents- they don't even realize they're not the real X-Men. But then the Skrulls decide to start the invasion, and in a Zoolander moment, they play a song that activates their Skrully programming ("It's Not Easy Being Green"???? ) and BOOM! Secret Invasion! This also explains how Wolverine is in so many places at once. Three Skrull versions of him. As a bonus, this gives Marvel an excuse to do an issue with four Wolverines all fighting each other.