Smith and Jones ( TV story ) Smith and Jones was the first story of the third series of the BBC Wales version of " Doctor Who " . It introduced the Judoon , a new version of the sonic screwdriver , and ( more notably ) the televised debut of companion Martha Jones and her family . It also firmly established that Harold Saxon was well - known to ordinary members of the British public , and obliquely suggested through set decoration that he was standing for the office of Prime Minister in 2008 — something which had been previously teased by the episodes " Love & Monsters " , " Captain Jack Harkness " and " The Runaway Bride " . The soundtrack notably introduced several new leitmotifs — including the much - used " Martha ' s Theme " that appeared in Jones ' later " Torchwood " appearances . Furthermore , it featured the first extra - diegetic use of in " Doctor Who " history , in the form of Arrested Development ' s " Sunshine " to introduce Martha and her family at the very top of the episode . Due to a quirk of release scheduling , this was also the first time that " Doctor Who " served to premiere a song in the United States . " Sunshine " wasn ' t released in America until Halloween 2007 , months " after " the US release of " Smith and Jones " . Synopsis . Just when it seemed it would be yet another chaotic day managing her family ' s disputes , Martha Jones finds trouble waiting for her at work . Trapped on the Moon with space rhinos looking for a criminal and the air running out , she will have to come to trust a seemingly mad stranger calling himself " the Doctor " . But can the Tenth Doctor save the day this time ? Plot . While walking to work , medical student Martha Jones receives a series of phone calls from various members of her family . Each is calling about her brother Leo ' s 21st birthday party that evening . She is interrupted by a stranger ( the Tenth Doctor ) who takes off his tie , smiles and says , " Like so , see ? " and walks off . Bemused , she continues on . She arrives at the Royal Hope Hospital , bumping into a black - leather - clad motorcycle rider at the entrance , who ignores her . Later , getting her from her locker , she receives an electric shock from the door . The medical students , under the supervision of Dr Stoker , start their rounds with Florence Finnegan , who is diagnosed as being salt deficient , having had salad every day for the past week . The next patient they move onto is " John Smith " , the Doctor , who is posing as a patient admitted with abdominal pain . Martha asks him why he was on Chancellor Street that morning , but he denies having been there . She wonders whether he might have a brother , but he answers , " Not anymore . " Martha listens to his chest , finding the second heartbeat . He gives her a wink and she smiles back at him . Dr Stoker pushes Martha for an analysis of the patient and suggests it is always best to start with the patient ' s notes . As he picks up the clipboard , he receives an electric shock and Martha informs him of her own earlier shock . The other trainees all mention having similar incidents as well , but Dr Stoker mentions that it might be related to the incoming thunderstorms , continuing to ask who discovered static electricity . The Doctor correctly answers Benjamin Franklin , but goes on to ramble about how he was there and got electrocuted after being soaked so long in the rain . This prompts Dr Stoker to ask a nurse to recommend the Doctor for psychiatric . Later , Martha is chatting with her sister Letitia on the phone . Martha mentions that it is raining outside , but her sister says the weather is beautiful where she is , just a few streets away . She turns the corner and sees the hospital in the middle of its own storm . Martha is dismissive until her co - worker , Julia Swales , and sister both tell her that the rain is going up instead of down . There is a tremor , and when Martha looks out , she realises the hospital is on the Moon . Back where the hospital was , there is nothing left of the building , not even the basement . Tish looks on in horror . Behind her is something that makes the news even worse : the TARDIS ! The Doctor is now trapped on the Moon without any way to help the people escape back to Earth . Many of the patients and staff are running around in a panic , but Dr Stoker looks out calmly , while Florence Finnegan searches for him . Martha appeals to the patients for calm as she and Julia head for a window which Martha intends to open , whilst the Doctor nips behind a curtain . Julia panics , telling her that if she opens the window all the air will be sucked out . Martha calmly rationalises that that cannot be true as the window is not airtight , so it would have happened already anyway . The Doctor , who has instantly changed into a blue pinstripe suit , pulls back the curtain and tells Martha she ' s correct . They discuss why they can still breathe , and the Doctor is impressed with Martha ' s reasoning . He asks if they have any kind of balcony ; Martha tells him they have one for patients to use . The Doctor invites her to go step out onto it with him , warning her they might die . Martha calmly replies they might not , further winning the Doctor ' s approval . He then says her colleague isn ' t coming as she ' d slow them down . Going out on to a balcony , the Doctor asks Martha what she believes is going on . She firmly believes the situation is alien interference , noting that it would have sounded crazy a few years ago , but with the appearance of the Slitheen , Sycorax and Cybermen over the past two years , it ' s much more believable . As she continues to refer to him as Mr Smith , the Doctor informs her of his preferred title . Martha assumes he means " Doctor Smith " , but he clarifies he means just " the Doctor " . However , Martha tells the Doctor she believes he needs to earn that name . Saying he ' d better get working then , the Doctor tosses a stone that bounces off a force field . Martha then realises that the air in the hospital is all the air they have ; over a thousand people are inside . Why would anyone isolate them to the moon and leave them to suffocate ? As Martha ponders this , the Doctor tells her she can ask them herself as huge cylindrical ships appear and land outside the hospital . Black armoured soldiers march out in several long lines , and the Doctor identifies them as the Judoon . As Mr Stoker looks on , Florence enters , telling him she needs help . Mr Stoker says he does not believe he can help anyone and reflects on his plans to retire to Florida and how he believes he will never see his daughter again . Florence insists he can help her , and is joined by the two motorcycle delivery men , who are known as Slabs . Florence explains , " There are great tests to come . And terrible deeds , some of them my own " . She then explains she was salt deficient because she absorbs it well . However , she needs blood now , specifically his as she thinks it will be delicious . Telling the Slabs to hold Stoker , she takes out a bendy straw . Florence advances on him as he screams . The Judoon Troopers enter the lobby and begin scanning people . Their leader removes his helmet , revealing a head like a rhinoceros , then issues orders in an alien language ; the Judoon draw their guns . One of the trainee doctors , Oliver Morgenstern , attempts to speak for the human s , but the leader responds by shoving him against a wall and using a device in order to translate his own speech into English . He then scans Morgenstern , confirms him as human , and using a special marker , makes a black X on his hand . Hiding on a balcony with Martha , the Doctor says they are looking for non - humans — bad news for him , though he is also delighted to see a little shop . Martha does not believe that he is an alien . The Doctor tells her that Judoon are police - for - hire , and if they decide that the hospital is hiding a non - human criminal , every single person in the hospital could be sentenced to death as accomplices of the alien . The Judoon continue upwards through the building , scanning each and every human . Oliver Morgenstern tries to keep the patients calm during the procedure , but a male patient panics and strikes a Judoon from behind with a vase ( which merely shatters against the alien ' s armour ) . The Judoon captain quickly charges him with physical assault , declares him guilty , and sentences him to execution , all in under 20 seconds . The soldiers comply , shooting the man with energy weapons that completely incinerate him . As the shocked Morgenstern tells them they " didn ' t have to do that " , the commanding Judoon replies , " Justice is swift . " The Doctor attempts to get to information from a computer but finds the Judoon were stupid enough to wipe the records that could have helped find their target . He explains to Martha he had no idea they were coming and he had only checked into the hospital because of the " plasma coils " — the HO scoop lightning — building up . He asks her if she knows anyone who has checked into the hospital in the last week with unusual symptoms ; she says Dr Stoker would know and heads to his office . When she arrives , Florence is still sucking his blood . Martha runs off but Florence orders one of the Slabs to kill her . The Doctor meets her , explaining he got the back up system working , but Martha says she found the alien . Confused , the Doctor immediately grabs her hand and runs when the Slab comes into view . They run into a room with an X - ray machine . The Doctor seals the door with his sonic screwdriver and tells Martha to activate the machine when he says , " Now ! " . The Slab breaks in and the Doctor scorches it with radiation . Though Martha is concerned about the Doctor ' s exposure to the radiation , he explains that for a Time Lord , roentgen radiation like that in x - rays is harmless . He then absorbs the excess radiation and concentrates to expel it into one of his shoe s , which he then discards . Martha , astonished , tells him he ' s mad , to which the Doctor replies that she is right . He then takes off the other shoe and discards that as well — " You ' re right . I ' d look daft with one shoe " . Discovering his sonic screwdriver has been destroyed in the process , he expresses regret at first , but then throws it away when Martha calls him " Doctor " for the first time . Martha tells the Doctor about Florence , making him wonder why she ' d be having a snack now . He then realises she was drinking the blood to assimilate it and mimic human biology to trick the Judoon . He decides they need to find her before the Judoon can get a scan in ; it ' s too late . Florence has passed their scanning . The Doctor and Martha creep around to avoid the other Slab and she wonders if he has any back up . Annoyed , the Doctor complains as they move around the corner . However , they walk straight into the Judoon , who scan the Doctor ; he registers non - human . Deciding no further evidence is needed , the Judoon begin trying to shoot the Doctor , but he escapes with Martha to a lower floor . They pass Julia , who is giving extra oxygen to a patient . She confirms the oxygen levels are decreasing . The Doctor explains that Judoon will not be affected by the decreasing oxygen , as their lungs have big reserves ; the two of them are okay for now , since they ’ re running on adrenaline . They go back to Dr Stoker ' s office to find him drained of blood . The Doctor explains that Florence is a Plasmavore ; she ' s hiding here " like in Rio " . He then wonders why she would bother to pass as human , when the Judoon could still kill them all . Heading outside , he reads the signs and figures out she ' s gone to the MRI ; he notes that she is almost as clever as him . The Judoon come into the hall , declaring to kill the non - human . The Doctor tells Martha to give him time to find Florence , then kiss es her and runs off , leaving a startled Martha in his wake . The Judoon catch up with her and begin scanning her . They identify her as human , but with traces of non - human DNA from the kiss ; more extensive scanning is ordered . Meanwhile , the Doctor finds Florence tampering with an MRI device . He babbles a cover story , pretending to be just another amazed human who has no idea whatsoever about what is happening . She orders her remaining Slab to hold the Doctor while she explains her plan . She says the MRI device will overload , frying the brains of everyone in the hospital and half the population of Earth — her " little gift " — leaving her free to escape the Judoon because she is safe in the shielded room . The Doctor continuing to play dumb , telling her " big chief rhino " was increasing the scans to setting two . Florence panics , stating she must appear to be human again . The Doctor welcomes her to come home to meet the missus ; they can have cake . Florence declines , telling him that what she is going to do to him will hurt , but the dead don ' t tend to remember . The Slab holds the Doctor ' s neck out for her . Meanwhile , the Judoon have confirmed Martha is human ( giving her a docket to claim compensation in the process ) , and march to the MRI lab . Martha follows , arriving as the Judoon scans say the Doctor is dead . As Florence declares her humanity , Martha realises he sacrificed his life to save them . She scans Florence , who now registers as alien , having assimilated the Doctor ' s blood . The Judoon charge her with the murder of the Child Princess of Padrivole Regency Nine . Florence proudly admits her guilt ( claiming her victim had deserved it ) , then orders her minion to attack the Judoon ; they swiftly dispatch it . Florence tells the Judoon to enjoy their victory , but they are going to burn with her . The Judoon kill Florence and detect the problem , but declare their duty fulfilled and swiftly withdraw , angering Martha as the entire situation is their fault in the first place . The oxygen is nearly depleted and the magnetic overload is approaching critical state . Frustrated , Martha tries to resuscitate the Doctor herself , eventually thinking to apply compression to both his hearts . He awakens and staggers over to the machine , reaching for his absent sonic before unplugging the machinery . Martha passes out and the Doctor picks her up , crying for the Judoon to save them as they take off . It starts rain ing again and the hospital is transported back to Earth where Martha ' s sister Tish is waiting . Martha watches the Doctor leave and sees him head toward a strange blue box , but while she is distracted by her sister both the Doctor and the box disappear . At Leo ' s party , the family are arguing over Annalise ( Martha ' s father ' s girlfriend ) , who mocks Martha ' s claims of having been to the moon and cites the publicly released cover story ( involving everyone in the hospital being drugged in a conspiracy ) . The argument spills into the street , increasing in animosity as Martha ' s mother vents her resentment toward Annalise , and the whole family storms off , save for Martha , who spots the Doctor . He catches her eye , and she follows him around the corner , to see him standing before the blue box . She asks him what species he is , commenting that she doesn ' t get to ask that question very often . When he answers Time Lord , she quips that it ' s not pompous at all . He then offers her a trip to thank her for her help , but she tells him she does not have the time — she cannot go off into space with him , she has to go into town the following morning and pay bills . He informs her that his ship is also a time machine . She does not believe him . To her shock , the TARDIS dematerialises , then rematerialises ; the Doctor steps out , looking exactly the same as that morning , still holding his tie in his hand . Martha gapes and sputters , then asks him why he didn ' t just tell her not to go into work when he saw her that morning . He explains , " Crossing into established events is strictly forbidden . . . except for cheap tricks . " The Doctor introduces the TARDIS . Martha says it ' ll be tight quarters , and he tells her to take a look . She cautiously enters the TARDIS and is amazed that it is bigger on the inside . She asks about crew ; the Doctor says it ' s just him now , but sometimes he ' s had friends , and he talks about Rose , saying that they were " together " and that she is now " with her family " . He says that Martha is not replacing Rose ; he is just going to take her on one single trip to thank her for saving his life . She flirts with him , saying , " You ' re the one who kiss ed me . " He assures her that it was a genetic transfer , and she explains that she is not remotely interested — she only goes for humans . He says , " Good . " As he turns away , though , she looks quite sadly at the floor . The Doctor powers up the TARDIS . As the TARDIS flies through the time vortex it begins to shake violently , while the Doctor and Martha shake hands over the console . The Doctor says , " Welcome aboard , Miss Jones ! " , to which she replies , " It ' s my pleasure , Mr Smith ! "