The question everybody is asking themselves and each other is; "Why superheroes will appear in The Avengers"? And I am here to present some possibilities for you.
First off is Captain America, which is a confirmed super hero, due to the trailer saying "The First Avenger". And since the trailer says so we can just hope they don't decide otherwise.
Next up is Iron Man and The Hulk.
The reason why i'm putting these two together is due to the fact that at the end of the latest Hulk-movie Tony Stark came to a bar where General Thaddeus E. "Thunderbolt" Ross was having a drink.
Tony told General Ross that he and some other were putting together a team of people. And that they were interested in "The Hulk Project".
Nick Fury(Samuel L. Jackson), which most people have not heard of is going to appear in the movie, that I am 99% sure of.
Since he appeared in the Iron Man 2(The guy with the eyepatch).
And since Samuel L. Jackson has made a deal with Marvel Studios and Paramount Pictures to appear in nine movies as Nick Fury as well as The Avengers and any sequels to The Avengers.
I will present more possible superheroes in future posts.
And until then; Have a nice day.