Behind the scenes
The prison planet of the Grehollo system was mentioned in "Twinkle, Twinkle Little Star, How I Wonder Where We Are," a 1990 roleplaying game source article written by Glen Allison as a supplement for West End Games' Star Wars: The Roleplaying Game and published in Voyages SF 13. The article placed the Grehollo system in a sector of the same name. Since the article was released outside of the Lucas Licensing process, its canonicity within the Star Wars Legends continuity was never confirmed, and the StarWars.com Online Companion to the 2009 reference book The Essential Atlas instead placed the system, and therefore the planet, in grid square K-7 as part of the Manoe sector.
- "Twinkle, Twinkle Little Star, How I Wonder Where We Are"—Voyages SF 13 (First mentioned)