The Bubble Shield is a power-up item that appears in Sonic Generations. It is first used in a mission in Chemical Plant and after the mission is cleared, the Bubble Shield can be purchased in the Skill Shop at any time. This shield is the only one of the three obtainable shields that can be used underwater. It absorbs one hit as well as allowing the player's character to breathe underwater. Sonic can use this shield to bounce and slam downwards, slightly increasing his jump height, but if done on top of a badnik, the player can achieve a vast jumping increase, especially if done in water.