Some of these have explored and offered accounts of Christie's disappearance in 1926, including the 1979 film Agatha ( with Vanessa Redgrave, where she sneaks away to plan revenge against her husband ) and the Doctor Who episode " The Unicorn and the Wasp " ( with Fenella Woolgar, her disappearance being the result of her suffering a temporary breakdown due to a brief psychic link being formed between her and an alien ).

* The tapes for the revival of BBC show Doctor Who were labeled with the anagram Torchwood, which later went on to be used as the name for a spin-off show.

* The Ark ( Doctor Who ), a 1966 Doctor Who serial

The 2012 Big Finish Productions Doctor Who audio play The Wrath of the Iceni starring Tom Baker takes place during Boudica's uprising against the Romans.

In September 2010, MIT students attempted to put a TARDIS, the time machine from the BBC's Doctor Who, onto a roof.

The Fifth incarnation of Doctor Who, Peter Davison, was noted for wearing a stalk of celery on his lapel, claiming it at one point to be an excellent restorative, though the human olfactory sense was comparatively weak.

" He, too, has become a noted writer of his own high-profile television drama programmes, including Queer as Folk and the 2005 revival of Doctor Who.

In 1966, Kit Pedler, a medical scientist, created the Cybermen for the TV program Doctor Who, based on his concerns about science changing and threatening humanity.

* The Daleks, Cybermen and Toclafane from Doctor Who.

* The Doctor Who serial State of Decay features a vampire named Camilla who in a brief but explicit moment finds much to ' admire ' in the Doctor's female travelling companion Romana who finds she has to turn away from the vampire's intense gaze.

* " Conspiracy ", third episode of the 1965 Doctor Who serial The Romans

* The episode " The Stones of Blood ", of the 16th season of Doctor Who, the Fourth Doctor encounters the Ogri, a silicon-based life form, and in the same sub-plot, the Megara, who are made entirely out of an unknown substance, possibly energy, and they uphold the word of the law, and execute all who break the law with a beam of energy.

# REDIRECT Doctor Who

* Deimos ( Doctor Who audio ), an audio drama

Davros is a character from the long-running British science fiction television series Doctor Who.

Cast in the role of Davros was Michael Wisher, who had previously appeared in several different roles on Doctor Who and had provided Dalek voices in the serials Frontier in Space, Planet of the Daleks and Death to the Daleks.

During Doctor Who Confidential Russell T Davies explained how he believes Davros to have survived the Crucible's destruction in some way, not specifically showing his death for this reason.

Doctor Who Magazine printed several comics stories involving Davros.

Speaking with the Emperor, the Doctor addresses him as Davros, but the Emperor responds " Who is Davros?

Paul Cornell's dark vignette in the Doctor Who Magazine Brief Encounters series, " An Incident Concerning the Bombardment of the Phobos Colony " occurs sometime between " Resurrection of the Daleks " and his assumption of the role of Emperor.

In 2008, Julian Bleach appeared live as Davros at the Doctor Who Prom, announcing that the Royal Albert Hall would become his new palace, and the audience his " obedient slaves ".

* BBC Norfolk Online-RealAudio interview from the Holt Doctor Who Midsummer Invasion 2006

These security barriers were breached on occasion by the Sontarans, by manipulating the more technological Vardans, who suborned the Doctor into sabotaging both of these from within ( The Invasion of Time, 1978 ).

In the final story of season 15, The Invasion of Time, the Fourth Doctor conceded, " Not even the sonic screwdriver can get me out of this one.

In " Doomsday ", the Doctor states that the sonic screwdriver does not kill, wound or maim ; however, it is sometimes brandished in a threatening manner, such as in " The Christmas Invasion ", " The Impossible Planet ", " The Runaway Bride ", " The Lazarus Experiment " and The Infinite Quest.

" The Doctor also comments in The Invasion of Time that Sontarans can mass-clone themselves at rates up to a million embryos every four minutes.

* The Sycorax, a fictional alien race from the Doctor Who episode " The Christmas Invasion "

* Daleks – Invasion Earth: 2150 A. D., a film adaptation of the second Doctor Who TV story to feature the Daleks.

The Doctor also whistles the march in the serials The Invasion of Time, The Talons of Weng-Chiang and Destiny of the Daleks.

A common theme in Nation's science fiction is the depiction of post-apocalyptic societies, as in several of his Doctor Who serials, for example The Daleks, Death to the Daleks and The Android Invasion and in his series Survivors, which Nation created before Blake's 7.

In " World War Three ", the Doctor is able to shake off an electrocution attempt which is fatal to a number of humans, and appears unaffected by the energy whip wielded by the Sycorax in " The Christmas Invasion ".

In The Time Monster and Invasion of the Dinosaurs the Third Doctor is able to resist fields of slow time, being able to move through them even though others are paralysed.

In cases of non-fatal injury, Time Lords who have recently regenerated can use left over cellular energy to heal and even regrow severed limbs, as seen in " The Christmas Invasion " where the Tenth Doctor regrows a hand.

It is implied ( in The Invasion of Time and The Deadly Assassin ) that the terms " Gallifreyan " and " Time Lord " may not be synonymous, and that Time Lords are simply that subset of Gallifreyans who have achieved the status of Time Lord via achievement in the Gallifreyan collegiate system ; in the episode " The Sound of Drums " The Doctor talks of ' children of Gallifrey ' which implies that children are Gallifreyan before they are Time Lords.

* Alan Smithee was used as the name of the director of The Elusive David Agnew, a special feature on the Doctor Who: The Invasion of Time DVD release.

The revised script, now titled The Curse of the Sephiroth, was credited to " David Agnew ", a standard pseudonym used by the BBC and which had been previously used on Doctor Who for the season fifteen serial The Invasion of Time.

Peter Halliday had previously appeared in several Doctor Who serials including The Invasion and Doctor Who and the Silurians.

In the Doctor Who episode, " The Christmas Invasion ", the Tenth Doctor, saving the world in pyjamas and a dressing-gown, compares himself to Arthur Dent, whom he describes as a " nice man ", possibly suggesting that the Doctor has at some point inhabited the same universe as the characters in the Hitchhiker's Guide.

The character of Jones returned as Prime Minister in " The Christmas Invasion ", the Doctor Who 2005 Christmas special.

He was also meant to script the story that became The Invasion, however he was unable to do so, leaving then story editor and future Doctor Who producer Derrick Sherwin to script it himself.

The 2005 Doctor Who episode " The Christmas Invasion " featured the British Rocket Group, although the organisation was only identifiable by a logo not clearly seen on screen and never referred to in dialogue.

It was also used for the location filming of the Doctor Who serial The Invasion to represent the London offices of International Electromatics.

Invasion of the Dinosaurs is the second serial of the 11th season of the British science fiction television series Doctor Who, which was first broadcast in six weekly parts from 12 January to 16 February 1974.