Delphon was the homeplanet of the Delphon, a race that communicated with their eyebrows. Sometime before his second regeneration, the Doctor visited Delphon and learned the language of its natives. (TV: Spearhead from Space, AUDIO: The Havoc of Empires)

The Fourth Doctor sometimes carried golden Delphonian mega-dollars. (PROSE: Sarah Jane and the Temple of Eyes)

During the War in Heaven, the Time Lords suffered a disastrous rout at Delphon. Homunculette spent the entire battle inciting local populations to futilely attack the enemy, and his eyebrows ached from the effort. He watched the local star go supernova from the bridge of a war TARDIS before being called to Gallifrey Eight, where the loomstacks were working overtime to rebuild the destroyed forces. (PROSE: The Taking of Planet 5)

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