there's no one in the movie who isn't explained.

who's thor? He's a god. he had a hammer, now he doesn't, his dad's dead, you saw his brother and best friend die, he had to kill his sister and he has a new haircut now. THIS IS ALL IN THE MOVIE

who's the hulk? nigga have you not heard of the hulk?

who's black panther? king of wakanda. technologically advanced, rich as fuck and a total badass. all in the movie.

vision: got an AI brain and an infinity stone in his head. all in the movie.

you can go down the list.

www.engadgethd.com - the other stuff i'm looking at