Dalek Prime Minister

The Dalek Prime Minister is the ruthless leader of the Parliament of the Daleks and the primary antagonist of Season 15.

Role
Prior to Season 15, the Dalek Prime Minister had ordered his soldiers to capture the Thirteenth Doctor and enslave her to the Dalek Battle Computer.

The Thirteenth Doctor gains the other Doctors' trust by saving them from an attacking squad of Slitheen and brings them to her oil rig where she reports to the Prime Minister that she has gained their trust. The Prime Minister replies by telling her to keep earning their trust until she can imprison them alive.

After the Doctors escape from the oil rig with help from the Ice Warriors, they find out that the Thirteenth Doctor is enslaved to the Daleks' Battle Computer and that the Dalek Prime Minister is planning to release Dalek nanogenes into the universe, thus transforming every life form into Dalek puppets.

On Skaro, the Thirteenth Doctor tells him that the Ice Warriors have helped the Doctors to escape, but the Dalek Prime Minister tells her that the other Doctors are unimportant and that the nanogenes are ready for activation.

The Doctors and the Ice Warriors make it to the planet Skaro where the Dalek Prime Minister orders his soldiers to stop the Doctors from interfering with the plan, but the Doctors fight their way through the large army of Daleks and confront the Prime Minister, who sends out the Thirteenth Doctor to try and stop them.

Ultimately, the Doctors manage to destroy the Dalek nanogenes before they can be released into the universe. The enraged Prime Minister tells the Doctors that they haven't won yet, but Iraxxa kills him by blasting him with her Sonic blaster, breaking the link with the Thirteenth Doctor.

Personality
The Dalek Prime Minister's voice is softer and more controlled than the other Daleks' voices. He also has a snarky streak when taunting the other Doctors. Once his plan has been foiled, the Dalek Prime Minister loses all sense of calm and dashes himself against his casing before his death.