Black Dalek Leader

A Black Dalek known as a Supreme Controller directed the Dalek Earthforce and the Bedfordshire operation nearing the end of the 22nd century occupation of Earth. The Supreme Controller, was on board the Dalek flying saucer; saucer alpha-major, along with the Dalek Saucer Commander. It had a terrifying pet called the Slyther which it used to let roam free around the mines at night, killing those it found. The Supreme Controller was killed when the Dalek bomb detonated, having been sabotaged by Ian Chesterton. The Supreme Controller's voice was considerably higher than those of the other Daleks. (TV: The Dalek Invasion of Earth, PROSE: Doctor Who and the Dalek Invasion of Earth)

History
Operating during the 22nd century Dalek invasion, the Supreme Commander oversaw the conversion of Bedfordshire into a gigantic mining area, drilling through the Earth's crust to remove its core with a penetrative explosive capsule and then use a guidance system to pilot the planet elsewhere in space.

The Supreme visited London during one of the daily saucer landings to collect more slave workers and Robomen. Among the prisoners taken were the First Doctor, Ian Chesterton, and Larry Madison. However that night an attack by the Human resistance was carried out, and the prisoners escaped. After a group of the rebels killed one of the Daleks, the Supreme exterminated any humans he saw. After the attack had been defeated, the Supreme Controller ordered that all humans involved in the attack to be destroyed, however he was unaware that Ian was hiding under the shafts directly under him. The supreme controller had the Robomen place fire bombs around the city.

As the saucer left for Bedfordshire, a van stolen from the museum had gone on to escape London, attacking patrol 5, prompting the Supreme Controller to order an immediate attack on the van, destroying it but failing to kill the rebel passengers. After landing in Bedfordshire, the Supreme Controller was the first to depart the saucer, arriving in the control room to observe the final stages of the operation.

As the Daleks set the capsule in position and start the countdown, Ian, who was stuck inside, interfered with the wiring inside the capsule, disarming it. The supreme controller had the capsule brought back up, but a Dalek observing its ascent noticed Ian sneaking out from it, with the Supreme ordered Ian to to be exterminated. However, the Dalek only shot at the rope, believing Ian would die from the fall.

The captured Barbara Wright and Jenny were brought forward to the Controller, claiming to have information regarding a human rebellion; however the controller quickly realising they are lying had them restrained to ensure no more delays.

With the capsule re-armed, and ready, the controller personally sent the capsule down towards its target. However, he was unaware it had been jammed by a cord of wood across the shaft opening, preventing a re-armed explosive capsule from moving further down the shaft. As the controller, and his aides left, the Doctor and Carl Tyler had entered the control room releasing Jenny and Barbara. The Doctor then accidentally sent an alarm to the controller who orders two of his aides to exterminate them.

David and Susan manage to destroy the radio beacon, leaving the Robomen adrift and causing a temporary overload within the Daleks, who short circuit. Barbara and the Doctor give new orders to the Robomen to destroy the Daleks. With the help of the Robomen, Wells and Tyler lead the human slaves in rebellion, destroying any inert Daleks in their way and escaping the mine. The bomb explodes and destroys the Dalek fleet. (TV: The Dalek Invasion of Earth)

Personality
The Dalek controller was shown to be patient, short tempered, aggressive, quick thinking, and intelligent. The Controller also underestimated humans on several occasions. (TV: The Dalek Invasion of Earth)

Prop
The prop for the Supreme Controller is the same prop for the saucer commander, one of the four originally constructed for use in The Daleks. The production team didn't paint it in time for the show as seen during the attack on the saucer — the Commander went in but the Supreme came out — for it was not seen during the second part of part 2 and the rest of the episode.

Theatrical adaptation
In the film adaptation Daleks' Invasion Earth 2150 A.D., the Supreme Controller's role was replaced by two Daleks, a Gold Dalek and their subordinate Black Dalek.