Iron Man: House of M #1

Tony Stark fights in the Sapien Death Match where he beats Johnny Storm but is in turn beaten by Howard. He returns to his business to find that researcher Hank Pym has been trying to map the mutant genome. He fires him for this highly illegal activity. When he discovers that Pym has disappeared with all of his DNA research, Tony dons his new Iron Man armor and tracks him to a meeting of the human resistance movement. Sentinels have secretly followed him and Tony begins to battle the giant robots so the humans can escape. Unfortunately, he finds it is his father controlling the Sentinels.