We can all recognize that Marvel's "The Avengers" is one of the most ambitious undertakings in Hollywood history, assembling perhaps the most impressive ensemble of action heroes ever to share the screen (sorry, "Expendables"). Robert Downey Jr. as Iron Man, Chris Evans at Captain America, Scarlett Johansson as Black Widow, etc. You already know what it is.
But it takes more than superheroes to make a good superhero trailer. Watch closely and you'll see some heroic extras in the mix, too. We salute them.Here are our 5 favorites: