Hunter Dalek

From Tardis Wiki, the free Doctor Who reference
You may be looking for Pursuer-Dalek or Dalek hunter drone.

A Hunter Dalek, designated Hunter Dalek 4-3, was ordered by the Dalek Emperor to pursue the associates of Romana II after her sacrifice on Unity. As such it followed Narvin and Rayo to Micallon. The Dalek Supreme then ordered him to capture Narvin. It was eventually destroyed by them using a set of stasers. (AUDIO: Dissolution)