Hydron-three was a gas found in the atmosphere of the planet Geran, which the native species required to breathe. When traveling offworld, they would carry canisters of the precious gas, which could be added into their air intake. Obtaining supplies of the gas offworld could be quite expensive, especially on backwater planets such as Tatooine.
- Star Wars Customizable Card Game – Jabba's Palace Limited (Card: Sergeant Doallyn)
- The Essential Reader's Companion