- "We have our ways, Danni Quee. You will see."
- ―Prefect Da'Gara
When Danni Quee, a scientist from ExGal, arrived at Helska, the Yuuzhan Vong forces captured her and locked her up deep within Helska's ice. Later Kyp Durron's student Miko Reglia plunged down with his T-65 X-wing starfighter. He was also captured but died in Yuuzhan Vong custody. When the New Republic managed an offensive against the Yuuzhan Vong, they rescued Danni Quee and destroyed the battle coordinator yammosk, both inside Helska's frozen core. They managed to super cool Helska by using shielding ships to evaporate the surface ice, which upon re-warming caused the planet to shatter. Da'Gara and the yammosk were killed, and the Praetorite Vong were defeated and destroyed. After losing this fight, the Yuuzhan Vong were humiliated, and accelerated their invasion.
- Boba Fett: A Practical Man (Mentioned only)
- The New Jedi Order: Vector Prime (First appearance)
- The New Jedi Order: Agents of Chaos I: Hero's Trial (Mentioned only)
- The New Jedi Order: Agents of Chaos II: Jedi Eclipse (Mentioned only)
- The New Jedi Order: The Unifying Force (Mentioned only)
- The New Jedi Order Sourcebook
- The New Essential Guide to Characters
- The Complete Star Wars Encyclopedia
- Galaxy of Intrigue