The Stockpile were a team of high-tech mercenaries, working for Morgan Stark. The team tried to seize control of the Armory. Iron Man and War Machine stopped the Stockpile, destroying Brass and causing traumatic sensory feedback on Morgan. Fearing death, Morgan linked with every suit currently stored in the armory and used them to destroy Iron Man, as War Machine was occupied getting Sunstreak and Joust to medical treatment, giving Unicorn time to escape.
When Morgan was about to kill Iron Man, he choose to unmask him, revealing the younger Tony that the Avengers had only recently retrieved from an earlier alternate timeline. This gave Tony enough time to override the link to the suits, setting them to self-destruct. Morgan died at the Helicon facility.