abstract: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".
One thing that he always did when he went on his grand tour is he always took fake names, as if he was signing into a hotel as Mr. and Mrs. John Smith.