Mr Smith (The Sarah Jane Adventures)
| Mr Smith | |
|---|---|
| Doctor Who character | |
 |
|
| First appearance | "Invasion of the Bane" |
| Last appearance | "The Man Who Never Was" |
| Portrayed by | Alexander Armstrong (voice) |
| Information | |
| Affiliated | Sarah Jane Smith |
| Species | Xylok |
| Home era | Early 21st century |
Mr Smith is a fictional extraterrestrial computer voiced by Alexander Armstrong which appears in the British children's science fiction television series, The Sarah Jane Adventures, with further minor appearances in the final two episodes of the fourth series of Doctor Who. He is installed in the attic of Sarah Jane Smith's home, and is used to hack into other systems; Sarah Jane asserts that he can hack "into anything". He first appeared in "Invasion of the Bane", the 2007 New Year's Day première special, and has appeared in all the stories except The Eternity Trap and Lost in Time.
Mr Smith is a Xylok, a member of a crystalline race which crashed to Earth as a meteorite some 60 million years in Earth's past. It was trapped underneath the surface of the Earth until the eruption of Krakatoa brought a single, small Xylok to the attention of geologists. Sarah Jane received the crystal from a geologist friend as an aid to her studies in volcanic activity. She found that the crystal could communicate with her laptop; it revealed to her that it could help her track alien life and protect the earth. To this end it is the core of the supercomputer known as Mr Smith.
Mr Smith is hidden behind the chimney breast in Sarah Jane's attic at 13 Bannerman Road, Ealing, London. He reveals himself on the vocal command "Mr Smith, I need you". When he reveals himself as requested a fanfare plays (apparently diegetic, as Sarah Jane comments on it in the Doctor Who episode "The Stolen Earth"). The fanfare is omitted if summoned by the phrase "Mr Smith, I need you quickly and quietly," or if he determines that the fanfare would be inappropriate. He can request the attention of Sarah Jane and can be heard quite clearly from her living room, three floors below. Mr Smith can also be called through mobile phones. In The Gift (Series Three), Clyde called Mr Smith through K-9.
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