Dreg leader

In one possible timeline, Dreg leaders were the more powerful leaders of a pack of Dregs, the Dregs being the predatory, mutated remains of humanity on an Earth devastated by nuclear warfare.

Biology
Dreg leaders were fully intelligent and possessed a psychic ability to command the Dregs of their pack. (TV: Orphan 55)

History
One Dreg leader was encountered by the Thirteenth Doctor during Team TARDIS's trip to Tranquility Spa; she was able to reason with it, putting in a situation where it was in its advantage not to maul her and the other humanoids as it wished to. (TV: Orphan 55)

Behind the scenes

 * The Dreg leader in TV: Orphan 55 was portrayed by Spencer Wilding.
 * The Dreg design was made by Javier Aliaga.