Source:- http://www.beyondhollywood.com/the-skrull-...avengers-movie/
It’s always been long rumored that the Skrulls (pictured, below left) would be involved in some capacity, perhaps even as the brains behind a “loose” Hulk that forces SHIELD to assemble the heroes to contain. And of course, it makes sense that the Kree (pictured, below right) would show up if those pesky Skrulls, their nemesis, were around.

This actually lines up pretty well with previous rumors about the movie. If you were going to assemble a superhero team like Thor, Hulk, Captain America, and Iron Man, you’d need a pretty damn big threat to do it. An alien invasion by the Skrulls (or, ahem, a “secret invasion”) would do it.

spiderman not part of THE AVENGERS?

A membership that requires if they are fit in Avengers, right?