"It was a pretty poorly kept secret that Marvel planned to formally announce The Avengers today during the Marvel Studios panel in Hall H at the San Diego Comic Con, but that didn’t stop thousands of people going into geek rapture when the full cast walked out on stage.
After the Thor panel concluded, Marvel Studios president Kevin Feige dimmed the lights one last time, and an Avengers ‘A’ logo slowly resolved on screen as the voice of Nick Fury (Sam Jackson) explained the formation of the world’s biggest superhero team. And then Jackson himself came on stage to introduce the cast.
Jackson introduced the cast we know, all of whom strode out on stage. We’d just seen Clark Gregg (SHIELD Agent Coulson [from the Iron Man films and the upcoming Thor), Chris Evans (Captain America) and Chris Hemsworth (Thor) on other panels, but the appearances of Robert Downey, Jr. (Iron Man) and Scarlett Johansson (Black Widow) were surprises.
Then Downey took the mic, and before he got down to business he took a moment to comment on the wild ambition of Inception before proclaiming the idea of bringing together the leads of all of Marvel’s superhero films for The Avengers to be the most wildly ambitious movie idea yet hatched.
Then he introduced Jeremy Renner as Clint Barton, aka Hawkeye, and Mark Ruffalo as Bruce Banner, aka The Hulk.
Then Joss Whedon came out, grinning like a madman. 'I’ve had a dream all my life,' he exclaimed, 'and it was not this good!' (Then, in typically self-depricating style, he jokingly added 'and I am going to blow it.')"
A video detailing each actor and what role they will play in The Avengers straight from Marvel.
Here's also the logo teaser that Marvel had at Comic-Con: