"Smith and Jones" is the first episode of the third series of the British science fiction television series Doctor Who. It was first broadcast on BBC One on 31 March 2007. It sees the debut of Freema Agyeman as medical student Martha Jones. Agyeman had previously appeared as Martha's cousin Adeola in the 2006 episode "Army of Ghosts". The episode also introduced Martha's family, her mother Francine (played by Adjoa Andoh), father Clive (Trevor Laird), sister Tish (Gugu Mbatha-Raw), and brother Leo (Reggie Yates).
The episode sees alien police-for-hire called the Judoon transporting a London hospital to the Moon to hunt down a shapeshifting alien fugitive called "Florence Finnegan" (Anne Reid), who is posing as a human patient inside.
The episode was shot mainly in August 2006, with Singleton Hospital and the University of Glamorgan doubling as the fictional Royal Hope Hospital. According to the Broadcasters' Audience Research Board figures, it was seen by 8.7 million viewers and was the ninth most popular broadcast on British television in that week. It garnered an Appreciation Index of 88.
Plot
A London hospital along with its staff and patients is transported to the Moon. Three spaceships land nearby, and the hospital is invaded by the Judoon, an intergalactic police force for hire who are searching for a Plasmavore, an alien with the ability to appear as the species whose blood it consumes by internally changing its shape. The Judoon begin scanning everyone in the hospital, cataloguing the humans whilst attempting to find the non-human criminal. The Tenth Doctor, posing as a human patient to investigate the hospital, talks to medical student Martha Jones, revealing that he is an alien as well. The two go down to the lobby to find out what the Judoon are doing. An older lady named Florence Finnegan reveals that she is the Plasmavore. She drains Mr Stoker, the head of the hospital, and consequently registers as human when the Judoon scan her. The Doctor knows if he is scanned he will register as non-human, so he and Martha quietly avoid the Judoon, who will also likely execute all people within the hospital on grounds of harbouring a fugitive if they discover a non-human in the building. As the oxygen level in the hospital drops, people begin to collapse.
The Doctor finds Florence in a magnetic resonance imaging (MRI) room, where she is modifying the scanner to make it destroy all life on the Moon and the half of the Earth currently facing it. The Doctor pretends to be a confused human and Florence drinks his blood until he collapses. Martha enters and grabs a Judoon scanner and exposes Florence as non-human. Confirming Florence is the fugitive they seek, the Judoon execute her for the murder of an alien princess and return to their ships. Martha uses cardiopulmonary resuscitation on the Doctor's two hearts to revive him. The Doctor disables the modified MRI and the Judoon finally shift the hospital back to Earth seconds before everyone perishes from oxygen deprivation.
That evening, after a birthday party for Martha's brother Leo ends in a fight, the Doctor invites Martha to go on a trip with him. Martha hesitates until the Doctor says he can travel in time as well. Martha steps into the TARDIS, and the Doctor tells her that she is only going on one trip with him.
Continuity
Morgenstern refers to a "Saxon" during his radio broadcast, claiming that the events of the episode prove Saxon's theories about alien life correct; in the preceding episode, "The Runaway Bride", a Mr Saxon is said to have given the military the order to fire on the Empress's ship. A "Vote Saxon" poster, identical to one seen in the Torchwood episode "Captain Jack Harkness", and also in the trailer for the series, can be seen in the alleyway when the Doctor collects Martha. 'Mr Saxon' became the running theme for the third series, which came to its conclusion in the episodes "Utopia", "The Sound of Drums" and "Last of the Time Lords".
Martha refers to the spaceship crashing into Big Ben in "Aliens of London", the events of "The Christmas Invasion" or "The Runaway Bride", and the Battle of Canary Wharf against the Cybermen from "Army of Ghosts". She also recalls the loss of her cousin Adeola who "worked at Canary Wharf" and disappeared, a reference to the "Army of Ghosts" character played by the same actress.