Piston serves as the main antagonist of Mr. Torgue's Campaign of Carnage. As the current holder of the Number One Badass spot on the Torgue leaderboards, Piston will do anything to maintain his rank. After meeting the Vault Hunters, he offers to be their sponsor so they can rise in ranking. However, after they complete their first match, Piston fills the arena with Harmstrong gas, knocking them out. He then claims the Vault Hunters ran away, leading to Mr. Torgue branding them a coward. Shortly after, however, Mr. Torgue reveals that he only went along with the lie for good T.V.
Throughout the campaign, Piston constantly taunts the Vault Hunters as an attempt to intimidate them. However, he remains in the background pulling strings until they battle Flyboy, whereupon he kills Flyboy and invades the battle in his personal blimp. After the blimp is beaten and crashes, Piston survives and retreats to the arena. When the Vault Hunters show up to finish him, Piston is found piloting a massive vehicle known as the Badassasaurus, and uses it to fight them. After it too is destroyed, he is forced to fight the Vault Hunters on foot. Upon his death, Piston fufills his role as the "Ultimate Coward" as his blood opens the vault in the arena.
The blimp he uses during the fight with Flyboy can be seen in the Badass Crater of Badassitude before and after the fight. After beating it for the first time it is damaged and burning yet still flying.
- Main article: Long Way To The Top
- My pecs are laughing at you! *mimics pecs laughing* You hear that?!
- How many pecs to you have? 2? I Have 13!
- It's not cheating, it's tactics!
- Piston is a non-respawning boss.
- In True Vault Hunter Mode and Ultimate Vault Hunter Mode, Piston's name appears as Piston the Cheater.
- Piston has a chance to drop the Slow Hand.