Mister Bubbles is a promotional cosmetic item for the Engineer. It is a small, homemade, floppy doll with a spiral like torso, arms made of springs with hands made of spools, with one arm sporting a corkscrew, meant to resemble a drill, and a large circular head with bottle caps attached to both sides of the head with six sown on yellow hexagon buttons in a circular formation.
- The Mister Bubbles was added to the game.
- [Undocumented] Removed the promotion restrictions from the Mister Bubbles.
- This item is based on a Bouncer, one of five Big Daddy models.
- The item's name refers to a nickname given to Big Daddies by Little Sisters in the BioShock series.