Marvel and Walt Disney have released a third clip and a new featurette for Joss Whedon's The Avengers.  In the newest clip, we see Robert Downey Jr. as Tony Stark confronting Tom Hiddleston as Loki in Stark's New York City apartment.  The featurette entitled "Avengers Assemble" features some behind-the-scenes footage, scenes from the trailers, as well as Whedon, Downey Jr. and Scarlett Johansson talking about their roles and the movie.  It's a fluff piece, but you still might dig it.And speaking of The Avengers, tonight is the world premiere in Hollywood, as well the first time Marvel is showing the movie to people doing the massive press junket in Los Angeles this week.  What that means is….you can expect the first reviews to hit social media late tonight.  I'm attending the press screening and if we're allowed, expect my initial thoughts on Twitter after the screening ends.  Also, look for new interviews with the cast and filmmakers in the coming days and weeks.  Until then, check out the clip and featurette after the jump.Click here for all our Avengers movie coverage which includes my set visit, on set interviews, clips, trailers, posters and so much more.  And if you missed the first and second clips, just click the links.The Avengers stars Robert Downey Jr., Chris Evans, Chris Hemsworth, Mark Ruffalo, Scarlett Johansson, Jeremy Renner, Tom Hiddleston, and Clark Gregg.  The Avengers opens in 3D on May 4th. avengers-character-poster-chris-hemsworth-thor-scarlett-johansson-black-widow