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 ".

Telos continues to publish non-Doctor Who works and unofficial Doctor Who reference works, including the well-regarded 2003 book The Television Companions ( by Howe and Walker, and previously released as Doctor Who: The Television Companion in 1998 by BBC Publishing ) and The Handbook, collecting the previously written Virgin Publishing guide books Doctor Who The Handbook in one volume in 2005.

* Doctor Who The Handbook: The Fourth Doctor ( paperback, co-written with Walker & Stammers, 1992, Virgin Publishing )

* Doctor Who The Handbook: The Sixth Doctor ( paperback, co-written with Walker & Stammers, 1993, Virgin Publishing )

* Doctor Who The Handbook: The First Doctor ( paperback, co-written with Walker & Stammers, 1994, Virgin Publishing )

* Doctor Who The Handbook: The Third Doctor ( paperback, co-written with Walker, 1996, Virgin Publishing )

* Doctor Who The Handbook: The Second Doctor ( paperback, co-written with Walker & Stammers, 1997 Virgin Publishing )

* Doctor Who The Handbook: The Seventh Doctor ( paperback, co-written with Walker, 1998 Virgin Publishing )

* The Handbook: The Unofficial and Unauthorised Guide to the Production of Doctor Who ( paperback / hardback, co-written with Walker & Stammers, 2005, Telos Publishing )

In the Fifth Doctor story Resurrection of the Daleks, a small Dalek force aided by human mercenaries and Dalek duplicates liberates Davros ( now played by Terry Molloy, with a new mask designed by Stan Mitchell ) from his space station prison, needing his expertise to find an antidote for a Movellan-created virus that has all but wiped them out.

Not all iterations of the Doctor have used the sonic on screen ; the Fifth Doctor in fact opted not to replace his after it was destroyed.

The sonic screwdriver was written out of the series late in season 19, in the Fifth Doctor serial The Visitation.

The Tenth Doctor joked about the Fifth Doctor's lack of sonic screwdriver in the mini-episode Time Crash, commenting that he " went hands-free " and could " save the universe using a kettle and some string.

Big Finish Productions first used the Sontarans for their audio drama Heroes of Sontar-a 2011 Fifth Doctor story.

They next featured in The Five Companions and were stuck in an alternative version of the Death Zone with the Fifth Doctor and various companions.

In " Frontios " ( 1984 ), the Fifth Doctor believes the TARDIS to have been destroyed in a meteorite bombardment, apparently contradicting the earlier claim of indestructibility.

In the 2007 Children in Need special " Time Crash " the Fifth Doctor complains to the Tenth Doctor that he had " changed the desktop theme!

Reportedly, he also advised the Fifth Doctor, actor Peter Davison, to limit his time in the role to three seasons in order to avoid being typecast and the young actor followed that advice.

The Monk was easily defeated by the Fifth Doctor.

The Fourth Doctor regenerates into the Fifth Doctor ( from Logopolis, 1981 ).

* In " Time Crash ", the Fifth Doctor could not instinctively recognise that the Tenth Doctor was a Time Lord, much less one of his own later incarnations.

The Fifth Doctor also showed a similar ability in his final televised story " The Caves Of Androzani ".

In " The Caves of Androzani ", the Fifth Doctor remains conscious throughout the entire course of his ( eventually fatal ) spectrox toxaemia, while his human companion Peri loses consciousness as the disease worsens.

More recently, she has appeared with the Fifth Doctor in The Chaos Pool, the final part of the Key 2 Time trilogy, where it is revealed that Romana's regeneration was at least partly caused by her transformation into the new sixth segment of the Key to Time, the audio concluding with the segment's essence being transferred back to Astra to save Romana's life before the Doctor destroys the Key for good.

The Fifth Doctor encountered many of the Doctor's best-known adversaries, including the Daleks ( in Resurrection of the Daleks ) and the Cybermen ( in both Earthshock and The Five Doctors ).

Davison did, in fact, return to play the Fifth Doctor in the 1993 multi-doctor charity special Dimensions in Time and in the 1997 video game Destiny of the Doctors ( audio only ).

He returned once again in " Time Crash ", a special episode written by Steven Moffat for Children in Need ; in the episode, which aired on 16 November 2007, the Fifth Doctor met the Tenth Doctor, played by David Tennant, who would later become Davison's son-in-law.