The Ninth Galaxy was the galaxy that contained the planet Svartos. (PROSE: Dragonfire) The Thirteenth Doctor explained that being "Ninth" depended on where one started counting from, as it was the Seven-Billion-and-Third Galaxy when standing on Hastus Major. (PROSE: At Childhood's End) Circa 2000000, it was part of the Twelve Galaxies. (TV: Dragonfire)
When the Sixth Doctor initially thought he and Charlotte Pollard landed on the planet Spiridon, he stated it was in the ninth system of "a far away galaxy", later called the "ninth galaxy" and later the "galaxy of Antares". (AUDIO: Brotherhood of the Daleks)
In the five hundred years leading up to 4000, the Daleks conquered the Second, Third and Ninth Galaxies in a war across the Outer Galaxies, (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe) also conquering worlds in the Ninth Galactic System, though whether that was the same as the Ninth Galaxy is unclear. (TV: Mission to the Unknown)
| |||||||||||||||||||||||||||||||||||||||||||||