guest starring return in Enemy of the Bane, he is referred to in "Invasion of the Bane", Revenge of the Slitheen, The Wedding of Sarah Jane Smith and Death of the Doctor. Sarah Jane considers naming Luke after him when selecting the boy's name. M Mr Smith 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 (Elisabeth Sladen) home, and is used to hack into other systems; Sarah Jane asserts that he can hack "into anything". He first appeared in the premiere New Year's Day special "Invasion of the Bane" (2007) and has appeared in every story except The Eternity Trap (2009). See also List of The Sarah Jane Adventures monsters and aliens List of Doctor Who supporting characters List of Doctor Who villains List of Torchwood characters References Sarah Jane Sarah Jane