The Ten Galaxies were a group of galaxies ruled by the Dominators and their Quark servants, calling themselves the "Masters of the Ten Galaxies," (TV: The Dominators) although the claim went unchallenged (PROSE: Mutually Assured Domination) and William Bishop later wondered if it was simply propaganda. (PROSE: The Two Brigadiers)

Amoung the galaxies were Phi-Ralix, the Dominators' home galaxy, and the Mutter's Spiral. (PROSE: Mutually Assured Domination) The Dominators tried to conquer Gallifrey which resided in another galaxy, (AUDIO: Time in Office) and the Silfrax Galaxy may have been one of the Ten, but it was uncertain if the Vespiforms were the Giant Wasps used by the Quarks, since there were whispers of a war between Vespiforms and Quark Rebels. (WC: Monster File: Vespiform)

Races conquered or encountered by the Dominators included the Bandrils, Tivolians, Gonds, Gurdels, Monoids, Ogrons, Valethske, (PROSE: Mutually Assured Domination) and the Dulcians. (TV: The Dominators)

The Dominators tried to take over Earth in the 1950s, (COMIC: Quiet on the Set) 1969, (PROSE: Mutually Assured Domination) and 1984. (COMIC: The Fires Down Below)

In the far future, the galaxy QSO 0046 was part of the Ten Galaxies. The Grand Matriarch of the Panjistri on Kirith told Darien that in ten years time, he would surely be the greatest musician in all the Ten Galaxies. (PROSE: Timewyrm: Apocalypse)

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