Last night, some new set photos from The Avengers arrived which feature Chris Evans as Captain America fighting an actor in a motion-capture suit, and another with Captain America holding a bizarre otherworldly weapon. It seems we may have some answers to those mysterious photos as an on-set insider confirmed that The Skrulls will be villains in The Avengers, alongside Tom Hiddleston's Loki.
The involvement of The Skrulls has been rumored for some time now, with one report dating back to December 2010, and another report from March which alleged The Skrulls would team up with Loki. Those reports were never confirmed by Marvel.
The Skrulls, which first appeared in the Marvel comic books in 1961, are a shape-shifting race of aliens who can turn into any living creature or inanimate object. It isn't known how they become involved with Loki in The Avengers story line as of yet, but their presence in the movie would explain the motion-capture actors and the bizarre firearms.