You may be looking for Galaxy Three.

The Third Galaxy was the galaxy in which the planets Urbinia and Baralda were located. Urbinia's capital city, Kiria, was a seat of great learning throughout the whole galaxy.

In an alternate timeline, the Daleks entered the Third Galaxy with a functioning Time Destructor. They destroyed Baralda and invaded Urbinia. The Second Doctor averted the timeline by ensuring his previous incarnation arrived on Kembel to stop the Daleks. (AUDIO: Daughter of the Gods)

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