Tony Stark is Iron Man: Technological visionary, wealthy playboy, unparalleled engineer and armored Avenger. But in one terrifying instant, his greatest invention becomes his greatest mistake. The lethal techno virus Extremis is out in the wild and out for grabs to the highest bidder. Introducing the Circle, a mysterious high-tech brotherhood of mech-knights, as Tony's hunt for the rogue Extremis Units takes him to the island of New Camelot. It's up to Tony to contain Extremis, and that means creating a new suit of armor. Collecting Iron Man Vol.6 #1-6.