Dalek Executioner (The Guide to the Dark Times)

The Dalek Executioner, also referred to as the Execution Unit, (AUDIO: The Enemy of My Enemy) was a Dalek Executioner and member of the Time Squad, a battalion of Time-Sensitive Daleks deployed by the Emperor to attempt to make history more favourable to the Daleks after a divergence in the timeline was detected, (PROSE: The Guide to the Dark Times) which rewrote history so that the Daleks had not fought the Last Great Time War. (COMIC: Defender of the Daleks)

Occupied only with killing, it was thought by the Dalek Prime Strategist to be a "thoroughly stupid creature". (PROSE: Exit Strategy)

Physical appearance
The Executioner's casing was a unique Dalek variant: it had the broad design of a Bronze Dalek but had a dark, gunmetal-grey base unit combined with a black dome and slats (PROSE: The Guide to the Dark Times) similar to one of the Emperor's Personal Guards. (TV: The Evil of the Daleks) Its black sense globes were ringed with crimson its eyestalk's lens likewise glowed red, while its luminosity dischargers were yellowish. Instead of the familiar plunger-like structure, its manipulator arm ended in a three-fingered "claw", each "finger" resembling the blade of a scythe. (PROSE: The Guide to the Dark Times)

Enemy of the Entity
The Executioner oversaw the extermination of the population of Islos during the invasion to seize the Archive. When the Archivians surrendered, he accompanied the Emperor and Prime Strategist into the Archive but they found it empty. He demanded to know what the Archvians had done and exterminated all but the Chief, who explained they’d made a deal with an Entity outside of space and time, giving it the Daleks. The Entity emerged from portal in front of the Daleks (WC: The Archive of Islos) and attacked them, forcing them to flee Islos.

When the Entity followed them back to Skaro, the Executioner oversaw the Daleks’ attempt to defend Skaro but reported their weaponry was ineffective, forcing the Emperor to order an evacuation. After a dormant army awoken by the Strategist to be reinforcements was compromised by the Entity, the Executioner led Dalek forces against them. (WC: The Sentinel of the Fifth Galaxy)

The Time Squad
The Executioner was part of the Time Squad that the Emperor sent to rectify the temporal fluctuations. (PROSE: The Guide to the Dark Times) When the Squad captured the Eighth Doctor, he tried to exterminate him but was stopped by the Strategist. He travelled with the Time Commander, Scientist and Strategist to Wrax, planning to study their superweapon, along with the Doctor. He accompanied the Commander and Scientist to meet the Wraxian President who agreed to demonstrate their weapon, the Devolver, and consider an alliance. She demonstrated the weapon however then trapped the three Daleks, revealing she intended to use the weapon against them. They escaped but the Strategist convinced them to let the Doctor negotiate. He agreed the Devolver’s dismantling in return for the Daleks’ withdrawal, also promising the Daleks to tell them his theory on the source of the fluctuations once they’d left. The Commander agreed, however secretly sent the Executioner back to Wrax. The Executioner used the Devolver to wipe out the Wraxians and then returned to the Squad as they prepared to travel to the Dark Times. (AUDIO: The Enemy of My Enemy)

Psychological profile
Melody Malone described the Executioner as "exceptionally cruel". Adept at torture, it was always willing to inflict pain on other beings to get what it wanted. In battle, it "always shot to kill", to the point that it would sometimes disobey orders for the sake of finishing off an opponent. (PROSE: The Guide to the Dark Times)

Behind the scenes

 * Speaking of his portrayal as the Executioner, Nicholas Briggs described him as "completely mad".