Vuilp

 was a Time Lord.

Vuilp was part of Xenaria's expedition to break the time loop surrounding Planet 5 about 12 million BC, so the Fendahl could be released and used against the Enemy. Like all members of the expedition, Vuilp had been changed into a Elder Thing as camouflage during the time period.

When the War TARDISes began to revolt after Compassion talked to them, a bull TARDIS broke its constraints. It changed to resemble a faceless sphinx and killed Vuilp. (PROSE: The Taking of Planet 5)