When Tony Stark dons his Iron Man armor, Justin Hammer takes control of it and manipulated the Iron Man armor to reveal his identity and place a mind-control collar on him when it turns out that Scott Lang and his daughter Cassandra Lang are his hostages.
Upon donning his Iron Man attire, Tony Stark is taken hostage by Justin Hammer, who then exploits the suit's capabilities to unveil Tony's true identity and implant a controlling device within him. Meanwhile, Scott Lang and his daughter Cassandra are being held by Tony.