In both the original run and since the 2005 revival, long-running British science fiction television programme Doctor Who has featured a number of story arcs . A story arc is an extended story which takes place over a larger number of episodes or serials, characterised by a gradual unfolding of plot points and introduction of narrative devices which come together in the arc's climax and dénouement. While character arcs exist over the course of many stories, they do not necessarily take the shape of an expanded story arc. A number of smaller arcs in the programme have taken the form of trilogies.

References to these arcs have since been made in both Doctor Who and its spin-offs such as Torchwood . Early seasons would feature story arcs which made up extended serials such as The Trial of a Time Lord but also loose umbrella titles such as The Key to Time . The new series has continued this trend with the introduction of "arc words" which are recognisable to the larger viewing audience such as "Bad Wolf", "Torchwood" and "Mr Saxon", which also constitute the story arcs for individual seasons.

The Master

Season 8 of Doctor Who involved the first appearance of the Doctor's arch enemy, the Master, portrayed then by Roger Delgado. Every story in the season involved the Master. At the very beginning, the Doctor is warned by a Time Lord that the Master, a convicted criminal and enemy of the Doctor's, has escaped from Gallifrey and may come to Earth seeking revenge, as proves to be the case. During this first story, the Doctor sabotages the Master's TARDIS and so traps the Master, as he is, on Earth in the 20th century. At the denouement of the subsequent story, however, the Master retrieves a missing component and escapes – only to return subsequently as a prisoner of Axos. He is next encountered in the future on an alien world and finally returns to Earth; in both these last two adventures his intention is to subvert an ancient power source having previously stolen secret files on such things from the Time Lords. At the very end of the season (in The Dæmons ), UNIT finally captures the Master and takes him into custody.

The Key to Time

The Key to Time is the umbrella title that links all six serials of Season 16 of Doctor Who . The arc was originally conceived of by producer Graham Williams, who had proposed it as part of his application for the producer's job in 1976. The name refers to the powerful artifact whose segments the Doctor, Romana and K-9 are searching for during the season.

A figure calling himself the White Guardian commissions the Doctor, Romana, and K-9 to find the six segments of the Key to Time, a cosmic artifact resembling a perfect cube that maintains the equilibrium of the universe. Since it is too powerful for any single being to possess, it has been split into six different segments and scattered across space and time, disguised by the raw elemental power within them into any shape or size. However, since the forces balancing the universe are so upset, the Guardian needs to recover the segments of the Key to stop the universe so that he can restore the balance.

The first segment is disguised as a lump of Jethryk on the planet Ribos. The second is the planet Callufrax, shrunk to miniature size by the space-hopping pirate planet Zanak. The third is the Great Seal of Diplos, which has been stolen by a criminal of that planet. The fourth is part of a statue on the planet Tara. The fifth has been consumed by the squid Kroll, causing it to turn into a gigantic monster. The final segment is a female humanoid — Princess Astra.

In the final episode, the Guardian attempts to take the Key from the Doctor. However, the Doctor sees through the figure's charade proving him to be, not the White Guardian but, the Black Guardian in disguise. The segments of The Key to Time are once again scattered across all of time and space.

The complete running time for all 6 serials in the arc is 633 minutes.

The Black Guardian returns in the 3-serial arc, "The Black Guardian Trilogy" involving the 5th Doctor and Vislor Turlough.

The Key to Time is available on DVD in North America and was released on region 2 (Europe) DVD on September 24 , 2007 .

Key 2 Time is a series of CD audio plays released by Big Finish Productions. Over the course of three stories, the Fifth Doctor must hunt down the redistributed segments of the Key, which are decaying the dimensions around them. The Doctor soon discovers the decay is a direct result of his actions in the first search for the Key, his attempt to assemble the Key using a makeshift sixth segment disrupting the balance between the segments and causing them to decay. The story ends with the Key being reassembled and the Doctor subsequently destroying the Key in the Chaos Pool where it was first made, undoing the damage it has caused and preventing anything from ever using the Key again. The three stories are The Judgement of Isskar , The Destroyer of Delights and The Chaos Pool .

Entropy

All serials of season 18 are linked together by the central theme of entropy. Within the season, the stories Full Circle , State of Decay and Warriors' Gate are also known as The E-Space Trilogy . The trilogy saw the TARDIS accidentally pass through a Charged Vacuum Emboitment (CVE) from its normal universe, N-Space, into a smaller one called E-Space. The trilogy served to introduce Adric as a companion in the first story Full Circle and marked the departure of companions Romana and K-9 Mark II in the final story Warriors' Gate . The season culminated in Logopolis where we learn that the CVEs were created by the Logopolitans to combat an Entropy field that ends up growing out of control and threatens to destroy the entire universe.

New Beginnings / Return of the Master

Overlapping the entropy arc are these three stories which cover the regeneration into Peter Davison's Fifth Doctor, chronicles the Master as he attempts to procure a new body, and return to his old patterns of trying to conquer the universe and defeat the Doctor. The trilogy was also used to introduce Nyssa of Traken and Tegan Jovanka as the Doctor's new companions. They was released on DVD in 2007 under the title New Beginnings .

The Black Guardian

See also: Mawdryn UndeadSee also: TerminusSee also: Enlightenment

During these three stories in season twenty, the Black Guardian tries to have the Doctor assassinated for denying him the Key to Time. To this end he employs the mysterious extraterrestrial English boys' school student Turlough.

The Trial of a Time Lord

Main article: The Trial of a Time Lord

The Trial of a Time Lord is the title of the fourteen-part serial that encompasses the entirety of Season 23. In the serial, the Sixth Doctor stands accused of transgressing the First Law of Time, with adventures from his past, present, and future examined and used as evidence of guilt or innocence.

Bad Wolf

"Bad Wolf" was a message spread throughout time and space by Rose Tyler after infusing herself with the power of the time vortex at the heart of the TARDIS. Describing herself as "see the whole of time and space", Rose acquired omnipotent reality warping abilities which she also used to obliterate a Dalek fleet. The Doctor then removed the lethal power of the time vortex from her through a kiss, saving her life and becoming the catalyst for his next regeneration. The full extent to which Rose used the power of the time vortex is unknown; even to Rose herself, who seemingly could not completely recall her actions (as evident from her genuine shock at Captain Jack's "death" in "Journey's End").

Bad Wolf arc

The phrase first appeared in the second episode of the 2005 series, and then in every story of that series thereafter. It also occasionally appeared in the 2006 to 2008 series.

Within the 2005 series of Doctor Who , the arc comprised the following episodes:

  • "The End of the World": The Moxx of Balhoon mentions in a half-heard conversation to the Face of Boe the "Bad Wolf scenario".
  • "The Unquiet Dead": When the clairvoyant Gwyneth reads Rose's mind, she says, "The things you've seen... the darkness.. the Big Bad Wolf!"
  • "Aliens of London"/"World War Three": A young boy spray-paints the graffiti BAD WOLF on the side of the TARDIS and later The Doctor makes him clean it off.
  • "Dalek": The call sign for Henry van Statten's private helicopter is "Bad Wolf One".
  • "The Long Game": One of the several thousand television channels being broadcast from Satellite Five is BAD WOLF TV.
  • "Father's Day": A poster advertising a rave in 1987 has the words "BAD WOLF" defacing it.
  • "The Empty Child"/"The Doctor Dances": The bomb that Captain Jack rides at the end of the story is labelled "SCHLECHTER WOLF", which literally translates as "Bad Wolf" in German (the appropriate translation, however, would be "Böser Wolf"; "schlecht" can refer to either low quality or bad character).
  • "Boom Town": A nuclear power plant is dubbed the Blaidd Drwg project, whi

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