Grey Dalek (Defender of the Daleks)

A dark Grey Dalek served as a leader to Silver Dalek drones with a more advanced design of casing in a paradoxical Dalek Empire who recruited the Tenth Doctor into a war against the Hond under the command of the Golden Emperor. These Daleks, to the Doctor's surprise, had no records of having fought in the Last Great Time War. (COMIC: Defender of the Daleks)