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 ".

For example, in Doctor Who spin-off Torchwood, created by Russell T Davies, a drug used to erase the memory of characters is called " retcon "; the use of the drug is often referred to by characters as " retconning ".

In the Doctor Who spin-off series, The Sarah Jane Adventures, Sarah Jane Smith uses a " sonic lipstick ", which is a gift the Tenth Doctor gave her alongside a new model of K-9 and her scanner watch.

* In the Doctor Who spin-off series Torchwood episode " Fragments ", genius Toshiko Sato's backstory reveals that she stole faulty designs from the Ministry of Defence and UNIT, which she used to construct a sonic device, referred to as a " sonic modulator ", to trade to a terrorist organisation in exchange for her mother.

The Sontarans are a fictional extraterrestrial race of humanoids from the British science fiction television series Doctor Who, and also seen in spin-off series The Sarah Jane Adventures.

The spin-off media have, on a number of occasions, had the TARDIS wait around for the Doctor for decades and even centuries in relative time.

* Past Doctor Adventures, a series of spin-off novels based on the long running BBC science fiction television series Doctor Who

This death was presumably caused by flooding of the building, which the Doctor was aware of, and would not have happened any more suddenly than the Sixth Doctor's apparent death by trauma in " Time and the Rani " ( although spin-off media have suggested that the assault on the TARDIS was not the sole reason for the Doctor's death ).

In the television show Doctor Who and the spin-off show Torchwood, the character Jack Harkness faces the same fate as Tithonus in that when brought back from the dead, he discovers he is now both immortal — in the sense of recovering well from being killed-and still ageing, albeit extremely slowly — perhaps over billions of years.

UNIT has appeared multiple times in Doctor Who when drastic events are involved, whilst Torchwood is the focus of a successful spin-off series.

The revival of Doctor Who led by the openly gay writer Russell T Davies has also seen nods towards the slash fans beyond the omnisexual Captain Jack Harkness and other characters from the spin-off Torchwood.

** In the Doctor Who spin-off series The Sarah Jane Adventures, Sarah Jane and the other regular characters live in Ealing, and the majority of the stories take place there.

However, the canonical status of these stories, as with all Doctor Who spin-off media narratives, is uncertain.

Skaro appears in the Big Finish Doctor Who audio stories The Mutant Phase and Davros ( where we learn that Skaro had two moons: Falkus and Omega Mysterium, names drawn from a chart of Skaro's solar system in a 1976 Marks and Spencer tie-in book-Falkus is there revealed to be an artificial planet created by the Daleks as a last refuge ), and was where the Emperor Dalek operated from in The Genocide Machine, and features prominently in the I, Davros spin-off series, looking at Davros's life and the events that led to him creating the Daleks.

BBV's next series was a spin-off from two Doctor Who stories in the 1970s in which the Doctor assisted the United Nations Intelligence Taskforce ( UNIT ) in defeating the Autons, robotic invaders sent to conquer Earth on behalf of the alien Nestenes.

* Tempest ( Bernice Summerfield ), a 1998 Doctor Who spin-off novel by Christopher Bulis featuring the character Bernice Summerfield

They also appeared in the Doctor Who spin-off Torchwood in its fourth episode, " Cyberwoman " ( 2006 ).

The comic book " City of Devils " ( 1983 ) features two Doctor Who companions, journalist Sarah Jane Smith ( likeness ' Elisabeth Sladen ) and robot dog K-9 uncover a hidden city of Silurians ( here, ' Eocenes ') in an Egyptian archaeological dig, who seek peaceful coexistence with humans ; this comic strip is based on the premise of failed television spin-off series K9 and Company.

The spin-off media have expanded on this fan conception, making the Agency an explanation and driving force behind many events in the Doctor Who universe.

* Julie Gardner ( 1969-), television producer previously responsible for Doctor Who and its spin-off Torchwood, now executive producer of scripted projects at BBC Worldwide ;

Helped considerably by the Soviet campaign against the novel, Doctor Zhivago became an instant sensation throughout the non-Communist world upon its release in November 1957.

Although no Soviet critics had read the banned novel, Doctor Zhivago was pilloried in the State-owned press.

In the screenplay by Anthony Hinds, the main character's name was changed from Doctor Syn to Parson Blyss to avoid rights problems with Disney's upcoming film version, and Captain Cleggs screenplay follows the novel Doctor Syn and the screenplay of the 1937 film closely with the exception of a tightening of the plot.

In the Arliss movie Doctor Syn, Syn escapes to sea with Mipps and the rest of the Dymchurch smugglers, whereas Captain Clegg ends more faithfully to the novel, with Parson Blyss being killed by the mulatto ( who is then killed by Mipps ) and then being carried to and buried in Captain Clegg's empty grave by Mipps.

BBC Radio 7 broadcast the six-part series, an abridged reading by Rufus Sewell of the original Doctor Syn novel, from January 4th 2010 to January 11th.

Terror Firma seemed to contradict the events of the Eighth Doctor Adventures novel War of the Daleks by John Peel, in which an unmerged Davros is placed on trial by the Dalek Prime, a combination of the Dalek Emperor and the Dalek Supreme.

In the Eighth Doctor Adventures novel The Ancestor Cell by Peter Anghelides and Stephen Cole, Gallifrey is destroyed as a result of the Eighth Doctor's desire to prevent the voodoo cult Faction Paradox from starting a war between the Time Lords and an unnamed Enemy.

In the last regular Eighth Doctor novel, The Gallifrey Chronicles by Lance Parkin, it is revealed that while Gallifrey was destroyed, the Time Lords were not erased from history.

* Matrix ( Doctor Who novel ), by Robert Perry and Mike Tucker

* Placebo Effect ( Doctor Who ), an original novel written by Gary Russell and based on the long-running British science fiction television series Doctor Who

Children's author Hugh Lofting referred to a seat in this passage from his novel The Story of Doctor Dolittle ; “ He came strolling down the gravel-walk, humming a sad song, till he reached a stone seat right under the tree where the parrot and the monkey were hiding .”

* The Past Doctor Adventures novel The Murder Game, set after The Power of the Daleks, has the Second Doctor escaping from a locked room with a box-shaped sonic device, in which he muses on the advantages of building a smaller model.

The novel Dreams of Empire by Justin Richards, set after The Ice Warriors and before Fury from the Deep, features the Second Doctor utilising the device to break through a concrete wall.

* The Eighth Doctor Adventures novel, Father Time, features an amnesiac Doctor attempting to recreate the sonic screwdriver with 1980s technology, eventually producing a bulky device nicknamed the " sonic suitcase ".

* In the Ninth Doctor Adventures novel The Clockwise Man the sonic screwdriver is used to cauterise wounds, as a soldering iron, and to stop a clockwork mechanism.

In Only Human it is used to restrain someone by welding wires to a chair ; in the same novel the Doctor informs Quelly that the device contains 29 computers.

* In the Tenth Doctor Adventures novel The Stone Rose, the sonic screwdriver is used to sedate animals.

* The Virgin Missing Adventures novel Venusian Lullaby established that the First Doctor had a sonic screwdriver.

* The unlicensed fan fiction novel Time's Champion speculates that the Sixth Doctor has re-built the sonic screwdriver.

* In the Eighth Doctor Adventures novel Alien Bodies, the Time Lord Homunculette has a sonic monkey wrench.

" The Virgin New Adventures novel Lungbarrow by Marc Platt records Susan telling the First Doctor that she gave him the idea when he was, implicitly, the " Other ".