The Poison Sky (TV story): Difference between revisions

{{Infobox Story

|image = Valiant- Close to ground - Copy.jpg

|series = [[Doctor Who television stories|''Doctor Who'' television stories]]

|season number = Series 4 (Doctor Who)

|story number = 192b

|doctor = Tenth Doctor

|companions = [[Donna Noble|Donna]]

|featuring = Martha Jones

|featuring2 = Wilfred Mott

|featuring3 = Sylvia Noble

|featuring4 = Trinity Wells

|enemy = [[General]] [[Staal]]

|setting = [[London]], [[2009]]

|writer = [[Helen Raynor]]

|director = [[Douglas Mackinnon]]

|producer = [[Susie Liggat]]

|confidential = Sontar-Ha! (CON episode)

|broadcast date = [[3 May (releases)|3 May]] [[2008 (releases)|2008]]

|network = [[BBC One]]

|format = 1x45 minute episode

|production code = 4.5

|prev = The Sontaran Stratagem (TV story)

|next = The Doctor's Daughter (TV story)

|clip = Donna Noble Vs a Sontaran - The Poison Sky - Doctor Who - BBC

|clip2 = The Doctor Ignites The Poison Gas - The Poison Sky - Doctor Who - BBC

'''''The Poison Sky''''' was the fifth episode of [[Series 4 (Doctor Who)|series 4]] of ''[[Doctor Who]]''.

* [[Kirsty Wark]] - [[Kirsty Wark]]

* When the Doctor cuts off Staal's speech on the video screen in mid-flow, a clip from {{w|CBeebies}} cartoon {{wi|Tommy Zoom}} is featured. The original plan to use a clip from {{wi|Shaun the Sheep}} fell through.

* [[Billie Piper]] appears very briefly as [[Rose Tyler]] on the TARDIS' screen in this episode. She receives screen credit, and is fourth-billed, for a performance that lasts less than one second and which was actually shot for another episode. According to [[Russell T Davies]] in an interview in [[DWM 396]], this cameo was not in the original edit of the episode, but was added just before broadcast when Davies learned how successful her unbilled cameo in ''[[Partners in Crime (TV story)|Partners in Crime]]'' was. Although it was reported that the clip came from "an untransmitted scene" from another episode, in fact, according to the DVD commentary for ''[[Midnight (TV story)|Midnight]]'', the scene was shot especially for ''Midnight'' during production of ''[[Turn Left (TV story)|Turn Left]]'' and Davies dropped the scene into ''The Poison Sky'', too. Davies said that like ''Partners in Crime'', advance review copies of this episode did not include the cameo. This scene was directed by [[Alice Troughton]].

* Billie Piper's brief cameo was taken from an earlier episode, most likely ''[[The Idiot's Lantern (TV story)|The Idiot's Lantern]]'' in which she was also shown shouting silently from a TV screen. ''In fact, the scene was filmed especially for ''[[Midnight (TV story)|Midnight]]'', and inserted into this episode at the last minute.''

* The Tenth Doctor's "Are you my mummy?" line was improvised by David Tennant because he forgot this line. ''There is no known behind-the-scenes source to back up this erroneous claim, and appears to originate with a Tumblr post that went mildly viral in the early 2010s.''

* The Doctor is able to tell when a companion is not themselves. He previously identified when [[Cassandra O'Brien.Δ17|Cassandra]] had taken over [[Rose Tyler|Rose]]'s body. ([[TV]]: ''[[New Earth (TV story)|New Earth]]'') The Eleventh Doctor would later recognise [[Amy Pond]] as a [[Ganger]]. ([[TV]]: ''[[The Almost People (TV story)|The Almost People]]'')

* In a [[Donna's World|parallel world]], the Sontaran invasion was stopped by [[Torchwood Three]]. The atmosphere was reverted to its previous state and the Sontaran flagship exploded by [[Gwen Cooper]] and [[Ianto Jones]], who were killed in the process. [[Jack Harkness]] was taken to [[Sontar|the Sontaran home planet]]. ([[TV]]: ''[[Turn Left (TV story)|Turn Left]]'')

* This story was released in the [[Series 4 (Doctor Who)|Series 4]] DVD box set in November 2008 along with the rest of the series.