Dalek 1 (The Witch's Familiar)

A bronze Dalek was stationed at Dalek control within the Dalek City on Skaro, where it observed the infirmary containing Davros during the Hybrid Incident. It alerted the Supreme Dalek to a breach in the infirmary, then what appeared to be Davros leaving the infirmary for Dalek control, but was actually the Twelfth Doctor operating Davros's chair. (TV: The Witch's Familiar)

Behind the scenes
This Dalek is identified in the script for The Witch's Familiar.