Heavenly Host

The Heavenly Host, or the Host, were service robots used by Max Capricorn Starcruisers. They were fashioned to look like Earth's angels. Their purpose was to provide information and other assistance to crew and passengers. However, the Heavenly Host lacked autonomy and would do anything their master authority ordered, including criminal acts such as murder.

History
Under the command of Max Capricorn himself, the machines turned deadly. They killed many of the passengers and crew of the Starship Titanic in 2008 as part of Capricorn's scheme to destroy his own ship and then retire a wealthy man.

Some of the Host were destroyed by an electromagnetic pulse set off by Bannakaffalatta, who used the last of his cyborg body's energy at the cost of his own life.

After Max Capricorn was killed by Astrid Peth, the Host reverted to the next highest authority figure, the Tenth Doctor, helping the Doctor reach the bridge of the ship to save it. (TV: Voyage of the Damned)

Technology
The Host spoke in a monotone voice and started sentences with the word "information". Replies to requests were kept very concise, even to the point of poor grammar such as sentence fragments; for example: "Information: stowaway." and "Information: no witnesses.". Security Protocol One allowed the person who executed it to ask three questions, which would temporarily override whatever other command the Hosts were executing until the three questions were answered, to which it would promptly return to its previous command. Additionally, at least one of the Host could be diverted from its current orders for a few seconds when the Doctor asked it in a raised voice: "Information override. You will tell me the point of origin of your command structure." The Host complied, answering with: "Information: Deck 31."

Each Host had a hinged jaw, which moved when they spoke. When given the command to commit murder, they would repeat the word "kill" numerous times. Each Host used a single Halo, mounted on struts protruding out of their heads, as a weapon which they threw at enemies, causing great harm due to its razor-edges. They also seemed to have a remote link to their users, as they would relentlessly bounce back towards them if they were deflected. The Tenth Doctor and his fellow surviving passengers used chunks of stray metal to deflect the halos with little success. However, the group combating them was saved by the cyborg Bannakaffalatta who used an electromagnetic pulse to disable the Hosts. A host could recover from the effect after a short time.

Without its halo, a Host would resort to hand-to-hand combat such as strangling a human by grabbing their neck and striking with their metal hands. They were capable of flight even without moving their wings and could hover mid-air.

An individual Host had the strength of ten men, and had a button on the back of their neck which would switch them off, making them rigid. When switched off, one could be carried and moved with ease. Its default position was standing still with their hands pressed together in front of them, seemingly as though they were praying.

Behind the scenes

 * The Heavenly Host were voiced by Colin McFarlane.
 * A free printable Heavenly Host Christmas tree ornament was featured in the 2007 Adventure Calendar.

The Visual Dictionary
The non-narrative source Doctor Who: The Visual Dictionary gave further information about the Heavenly Host: their metal hands could be used for dishing out karate-style blows to others, and their default position was standing upright with their hands in the prayer position.

The non-narrative source The Ultimate Monster Guide gave an additional piece of information about the Host—their "face" was a gold-coloured blank metal mask.