Okay, I'll get right down to it... Who is it? Ultron? No. Kang? No. Thanos? No. The Skrulls? No. The Kree? Yes.
Now you are like what? Let me explain why I think it is the Kree.
First off let's say why I think the others I mentioned above are not the other villain's in the Avengers...
Why not Ultron?
I think most of us realize why in this: Antman isn't introduced so his origins wouldn't be done right... plus it seems that The Avengers from what is rumored is an alien invasion movie... not a robot movie.
Why not Kang?
Again, most already know this... Fury is building his Avenger's team for some reason... Kang would just show up from his futuristic world, and Fury wouldn't know he was coming...
Why not Thanos?
Surprisingly enough several have believed this, no offence to those who have, you still may be right, but Thanos just doesn't make sense to be the first villain. Way too many story lines. How would Fury know he was coming? If he had the infinity Gauntlet why would he want the Cosmic Cube/Tresseract?
Why not The Skrulls?
Two reasons: 1. It has been rumored that it is not the Skrulls, and seemingly confirmed by a fellow CBMer who I will not mention. 2. It mess up a Kree, Skrull War storyline which I think they will do in an Avenger's movie down the road.
Why The Kree?
Think about it, they could easily be confused with the Skrulls as other reports have
been.
While some of these reports may be doubted they do slightly support my theory, even though they say it's the Skrulls:
Click here to see the article
Click here to see the article
Click here to see the article
Click here to see the article
This would also explain how it is Aliens yet isn't the Skrulls as a that fellow CBMer seemingly confirmed. Plus it would make perfect sense for setting up the Kree/Skrull War story line for the next film. Then it could introduce several interesting characters such as: Captain Marvel, or Ms Marvel.
This is how I think it may work. The Kree may be like in the Ultimate's version of the Skrulls, they might have slightly funded enemy technology for World War 2 and they may have even wanted the Cosmic Cube/Tresseract from the Red Skull so they could have an advantage on their enemy the Skrulls or for some other purpose. Fury might know this and know it's just a matter of time before they come back, so this may be why he's assembling the team. Loki might make a deal with the Kree, telling them the Cube is on earth and that in return for him helping them, they try to kill his brother or let him be the ruler of earth or countless other reasons.
Update:
Thanks to sharp sighted CBMer
Xenix spotted that this gun:
Looks almost exactly like this gun:
Which further proves my theory as it looks like it's Noh-Var, Captain Marvel's Gun!
Many thanks to CBMer
Xenix for the above!
So what do you think? Do you think I'm right? Is it the Kree? Well, say who you think it is in the comments below!
The Avengers explodes in a theater near you May 4th 2012!