The Dalek Prime was a senior-ranking Dalek according to some accounts. The title may have been interchangeable with Dalek Supreme, much in the same way that the Supreme was occasionally referred to as the Black Dalek.

The Dalek Prime was variously the last survivor of the Daleks created first-hand by Davros, the leader of the Daleks on Skaro (the Supreme commanding off-world operations) and an amalgam of the Supreme and the Dalek Emperor. (PROSE: The Chase, The Evil of the Daleks, PROSE: War of the Daleks)

During the Shoreditch Incident, the Seventh Doctor apparently tricked Davros into destroying Skaro. (TV: Remembrance of the Daleks, PROSE: Who Killed Kennedy) The Eighth Doctor was later taken to what was apparently Skaro, with the Dalek Prime in command. It told the Doctor that Antalin had been destroyed in Skaro's place. The Daleks loyal to the Dalek Prime then won a battle against those loyal to Davros. The Dalek Prime ordered Davros executed, but he may have been teleported to safety. The Dalek Prime decreed that the Daleks would rebuild. (PROSE: War of the Daleks)

The Dalek Prime was pulled through the Doctor's timestream, encountering the fifth, sixth, seventh and eighth incarnations of the Doctor. He was finally trapped in a time loop created by the Fifth Doctor. (AUDIO: The Four Doctors)

The Dalek Prime is commonly shown as a shorter Dalek with a spherical top section, rather like the TV21 Dalek Emperor.