Theoretically, there should be no question about the necessity to own a Captain American Blu-ray, which will be available October 25 along with a slew of interesting special features (which you can learn more about here). However, just in case you were on the fence, here's a little taste of the action to show you what you'll be missing.
The below trailer exhibits some of the behind the scenes bonuses, a short film and an "Assembling The Avengers" preview featurette available on the Captain America Blu-ray set. The Avengers is on course and set for a May 2012 release. The film will team Captain America (Chris Evans), Iron Man (Robert Downey, Jr.), Thor (Chris Hemsworth), the Hulk (Mark Ruffalo), Hawkeye (Jeremy Renner) and Black Widow (Scarlett Johansson) (all visible in this gritty poster and this destructive image) under the guidance of Nick Fury (Samuel L. Jackson) for what very well may be the most exciting movie of all time... until Dark Knight Rises.