The Piston was the thirty-first Iron Man suit created by Tony Stark, and one of the many armors he developed after the battle for New York against Loki and the Chitauri. The attack had left him with the feeling that the world couldn't be safe for long, and that he needed to build more suits until the next time Earth was in danger.
The Piston suit was among those summoned by Stark to battle Extremis-enhanced soldiers assisting Aldrich Killian's plot. It was controlled at the time by J.A.R.V.I.S., Stark's A.I. program. It dispatched an Extremis soldier, but was over-powered and broken by three others. The suit flew away to prevent its destruction, but crashed into a crane.[1]
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