Aliens of London

160a – "Aliens of London"
Doctor Who episode
The Slitheen spaceship crashlands in the Thames.
Cast
Doctor Christopher Eccleston (Ninth Doctor)
Companion Billie Piper (Rose Tyler)
Others Camille Coduri – Jackie Tyler Noel Clarke – Mickey Smith Penelope Wilton – Harriet Jones Annette Badland – Margaret Blaine Corey Doabe – Spray Painter Ceris Jones – Policeman Jack Tarlton – Tom Hitchingson Lachele Carl – Trinity Wells Fiesta Mei Ling – Ru Basil Chung – Bau Matt Baker – Himself Andrew Marr – Himself Rupert Vansittart - General Asquith David Verrey – Joseph Green Navin Chowdhry – Indra Ganesh Naoko Mori – Doctor Sato Eric Potts – Oliver Charles Jimmy Vee – Space Pig Steve Speirs – Strickland Elizabeth Fost, Paul Kasey, and Alan Ruscoe – Slitheen
Production
Directed by	Keith Boak
Written by	Russell T Davies
Script editor	Elwen Rowlands
Produced by	Phil Collinson
Executive producer(s)	Russell T Davies Julie Gardner Mal Young
Incidental music composer	Murray Gold
Production code	1.4
Series	Series 1
Length	45 minutes
Originally broadcast	16 April 2005
Chronology
← Preceded by Followed by → "The Unquiet Dead" "World War Three"

"Aliens of London" is the fourth episode of the Series 1 of the British science fiction television show Doctor Who that was first broadcast on 16 April 2005. Written by Russell T Davies and directed by Keith Boak, it is the first in a two-part story, concluding with "World War Three".

In the episode, alien time traveller the Doctor (Christopher Eccleston) takes his companion Rose Tyler (Billie Piper) back to the time she left with him, but accidentally arrive a year later. While Rose is dealing with the consequences with her mother Jackie (Camille Coduri) and her boyfriend Mickey Smith (Noel Clarke), a spaceship crashes into the River Thames, triggering a worldwide state of alert.

This episode introduced the character of Harriet Jones, played by Penelope Wilton, who became a semi-recurring character until 2008.

Intending to return Rose to Earth twelve hours after her original departure, the Doctor miscalculates, arriving twelve months after they left. Rose's mother Jackie is furious with her, believing that Rose had been abducted and murdered. Rose's boyfriend Mickey is also upset, as he was suspected of murdering Rose. As Rose expresses her frustration to the Doctor of not being able to tell the truth of where she's been, they witness a spacecraft crash through Big Ben and fall into the River Thames. Central London is shut down while the population become excited at the possibility of first contact with an alien species. The Doctor suspects trickery, and uses the TARDIS to land inside the hospital where the alien pilot has been taken. The Doctor discovers that the alien craft was launched from Earth, and that the pilot is really a common pig that has been modified by alien technology.