Dalek Emperor (The Twelfth Doctor's been Timejacked!)

The Twelfth Doctor knew that a Dalek Emperor held leadership of the Daleks by the time he took over someone's phone to send them a message. According to him, the Emperor had launched a plot to use the internet to convert the people of the 21st century into Dalek drones, which was something he needed to put a stop to "sooner or later". (WC: The Twelfth Doctor's been Timejacked!)