Marvel Studios has released its first full trailer for The Avengers, its Joss Whedon-directed dream teaming of Iron Man (Robert Downey Jr), Thor (Chris Hemsworth), Captain America (Chris Evans), Hulk (Mark Ruffalo), Black Widow (Scarlett Johansson), and team leader Nick Fury (Samuel L. Jackson), who team up against Loki (Tom Hiddleston), who emerged as a villain in the first Thor film. Whedon has the fanboy cred and they’ve done nothing here to dampen enthusiasm for a film that Disney releases May 4, 2012.