Harley Keener is a Tennessee local who had crossed paths with Tony Stark when the latter broke into his garage, seeking shelter and food. Keener allied with Stark in his quest to uncover the enigmatic Extremis program, and prevent the series of associated terrorist attacks that plagued the United States. Despite being attacked by Eric Savin, Keener proved to be a useful ally, as he had tended to the Mark 42 Armor in Stark's absence and helped track down the Mandarin in Miami. 