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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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. It is installed in the attic of Sarah Jane Smith's home, and is used to hack into other systems; Sarah Jane asserts that it can hack "into anything". It 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.