'Iron Man,' 'Bigger, Stronger, Faster*,' 'Forgetting Sarah Marshall'

Paramount, $34.99/$39.99; Blu-Ray, $39.99

The zippy superhero thrill ride that is "Iron Man" was one of the happiest surprises of the summer, both at the box office and in terms of how well it captured the high-flying adventure and relatable personal angst of a classic Marvel Comics character. Robert Downey Jr. gives one of 2008's best performances as cocky-but-flawed motor-mouthed playboy Tony Stark, a billionaire arms dealer who learns social responsibility when he straps on a life-saving, super-powered suit of armor.

The climactic fight between Iron Man and his equally armored arch-nemesis is relatively unspectacular compared with what comes before, but that's the only major flaw in an action movie that gives Downey and his costars -- including Gwyneth Paltrow, Jeff Bridges and Terrence Howard -- the space to do some funny, off-the-cuff acting while sporting fancy duds on expensive sets. The double-disc DVD and Blu-Ray editions add deleted scenes and comprehensive featurettes about the making of the movie and the history of the hero.

Bigger, Stronger, Faster*

Magnolia, $26.98

Christopher Bell's challenging first-person documentary “Bigger, Stronger, Faster*” takes an even-handed look at the subject of steroids, asking how and why a culture that values physical power has internalized the idea that drug use in sports is a scourge. Bell adheres too closely to the wry, fast-paced Michael Moore issue-doc style, but his personal connection to the issue -- both of his brothers are steroid users -- deepens the movie considerably, and Bell does his legwork as a journalist too, covering seemingly every angle of the issue. The DVD is even more thorough, packing on almost an hour's worth of thought-provoking deleted scenes.

Forgetting Sarah Marshall

Universal, $29.98, $34.98; Blu-Ray, $39.98

Judd Apatow protégé Jason Segel writes and stars in this raunchy comedy about a hopeless romantic who gets his heart broken by his starlet girlfriend (Kristen Bell), then keeps running into her -- even while on vacation in Hawaii. Like a lot of Apatow-backed projects, "Forgetting Sarah Marshall" is too long and too ragged, but Segel is an agreeable sort, and on the whole, the movie's funny moments outpace the draggy ones.

The single-disc DVD and Blu-Ray editions include a commentary track by cast and crew, plus deleted scenes, off-the-wall featurettes and an extended version of the film. A special triple-disc edition contains even more goofiness -- including puppetry.