Agellae

The Agellae were a belligerent race from the Acteon Galaxy, possessing an armada of at least 100,000 ships. During the time the Hexagora inhabited the planet Zagara IX, the Agellae attacked them and the Hexagora burned their fleet. The Fifth Doctor claimed no one knew what had happened to them. (AUDIO: Hexagora)

Astorius described them as a race of "hideous, moronic ape creatures". (AUDIO: Hexagora)