Psyche Dalek Three

Psyche Dalek Three was one of the special Psyche Daleks.

Biography
Psyche Dalek Three accompanied the Black Dalek sent to apprehend Davros on the planet Spiridon. He was tasked to control the Robomen, who had formerly been the Doctor's friends. Using a small control held in his claw and wired into his arm, he could detect mental activity and direct their actions. When he attempted to direct the robotised Abslom Daak to attack the renegade forces of the Ven-Katri Davrett, the Doctor blocked the signal by surrounding the control with the microthin metal of his map. The invisible Spiridons ifted him and smashed the casing for his brain against another Dalek. (DWM: Emperor of the Daleks!)

The existence of Psyche Dalek Three suggests that at least two other Psyche Daleks, Psyche Daleks One and Two, existed as well.