A new featurette for the Shane Black-directed sequel Iron Man 3 has been released online.  Its primary focus is to explain Extremis, the technology used by Ben Kingsley’s The Mandarin to pull off his terrorist tactics and inflict chaos in the world of Tony Stark.  Black and producer Kevin Feige explain the basics of Extremis and how it works in the human body to generate a new breed of unstoppable human beings.  We also get a bit of insight from James Badge Dale on why this new technology appealed to him in relation to his character.  Robert Downey Jr. seems particularly amused by the concept, citing it as one of the things he’s most excited about in the film.

Hit the jump to watch the new featurette.  If you missed the first two clips, you can check them out here and here.  The film also stars Gwyneth PaltrowGuy PearceDon CheadleRebecca Hall, and Jon Favreau.  Iron Man 3 opens in 2D, 3D, and IMAX 3D on May 3rd.

Via IGN.

Here’s the official synopsis for Iron Man 3:

Marvel’s Iron Man 3 pits brash-but-brilliant industrialist Tony Stark/Iron Man against an enemy whose reach knows no bounds. When Stark finds his personal world destroyed at his enemy’s hands, he embarks on a harrowing quest to find those responsible. This journey, at every turn, will test his mettle. With his back against the wall, Stark is left to survive by his own devices, relying on his ingenuity and instincts to protect those closest to him. As he fights his way back, Stark discovers the answer to the question that has secretly haunted him: does the man make the suit or does the suit make the man?

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