<P> 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 . </P>
<P> 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 . </P>
who is mr smith in sarah jane adventures
who is mr smith in sarah jane adventures
Alexander Armstrong
Alexander Armstrong