Everything from recurring rumors to images from abandoned video game tie-ins have pointed to the culprits being extraterrestrials that are all-too-familiar to hardcore Marvel comic books fans. Similarly, a previously-unveiled Avengers toyline press release seemingly revealed that another recognizable antagonist could also be making an appearance in the film.
President of Marvel Studios production Kevin Feige recently set the record straight (or did he?) during a talk with Empire Magazine. It goes without saying: if you do not want to be spoiled about who is, and who is NOT going to be teaming up with Loki in The Avengers, STOP READING NOW.