Klade

The Klade were a humanoid species.

History
The Klade originated on the Needle in the far future and were led by Prefect Ferran. The Doctor once encountered the Klade on Falkus. (EDA: Father Time)

The Doctor mentioned the Klade as being a potential threat to Gallifrey. (PDA: The Infinity Doctors) Marnal claimed that the Klade had the power to destroy the Time Lords and Gallifrey, but admitted that they would not have had the nerve to do so. (EDA: The Gallifrey Chronicles)

Behind the scenes

 * Klade is both an anagram of "Dalek" (as "Dalek" is itself of "Kaled") and a play on the biological term "clade", which is a group of species sharing a common ancestor.
 * According to the non-narrative source REF: AHistory, the Klade were the humanoid descendents of the Daleks.