Dalek Prime (The Four Doctors)

A Dalek Prime opposed the fifth, sixth, seventh and eighth incarnations of the Doctor.

Biography
The battle of Pejorica, fought between the Daleks and the Jariden, occurred at a point in Dalek history prior to the creation of a Dalek Prime encountered by the Doctor in command of a ship. Travelling back in time, this Dalek Prime was able to take control of the earlier versions of the Daleks fighting in the battle; they didn't know about his existence and rank. The time-travelling Dalek Prime, pulled through the Doctor's timestream and encountering the fifth, sixth, seventh and eighth incarnations of the Doctor, was finally trapped in a time loop created by the Fifth Doctor. (AUDIO: The Four Doctors)