In the episode, the alien crime family the Slitheen fake a spaceship crash-landing in the River Thames, putting the Earth on high alert.
The Series wide arc of "Bad Wolf"s appearance in this episode comes in the form of Graffiti, Scribbled onto the side of the TARDIS by an Unnamed Child.
As Rose expresses her frustration to the Doctor over not being able to tell the truth of where she had gone, they witness a spacecraft crash through Big Ben and fall into the River Thames.
Green is revealed to be a member of the Slitheen, a family of aliens that uses a device to compress their bodies into large human "suits" resulting in frequent releases of flatulence.
The Doctor is asked to join a panel of alien experts including members of UNIT, and Rose is escorted into the building by Harriet.
[5] Davies' decision to have the mobster family Slitheen invade Downing Street was inspired by the Girls Aloud "Jump" music video which takes place there.
[6] The production team had intended to suggest that the murdered Prime Minister in this episode was the current real-life incumbent, Tony Blair.
On the DVD commentary for "World War Three", producer Phil Collinson explained that they had hired an actor to play the dead body on the understanding that the man was a Tony Blair impersonator.
It was later changed to Unified Intelligence Taskforce in the Tenth Doctor story “The Sontaran Stratagem” after complaints from the real United Nations.
[10][11] The exterior of 10 Downing Street was a replica created a week later in Central London,[10][11] while the interior was filmed in Hensol Castle, Vale of Glamorgan from 4–6, 8–13 and 16–19 August.
[10] On 4 October the clip of Blue Peter presenter Matt Baker baking “spaceship cakes” was recorded in BBC Television Centre Studio 4 in London.
[1][10] During recording, the crew realised that the complexity of the first production block had caused them to fall behind schedule and, consequently, additional filming time was prescribed.
[10] Composer Murray Gold stated in an interview that the decision to mix CGI and prosthetics caused problems for the production crew.
[13] In an interview, Russell T Davies noted that he had to check with the editorial policy before screening the episode because it clashed with the 2005 United Kingdom general election.
[20] In 2013, Patrick Mulkern of Radio Times described the two-parter as "flashy but silly" and "disappointing", though the storyline of Rose's family worked because of the "vivid" characters.
He also praised the domestic situation, though he found the political satire "one-note", the direction disappointing, and Eccleston "out of his depth" with lighter moments.