Luke Smith played by Tommy Knight in The Sarah Jane Adventures
Luke hasn’t had an easy life. He was originally created by the alien Bane as part of their plan to take over Earth. Even though he was created by aliens he is fully human. After he helped defeat the Bane Sarah Jane adopted him.
Luke is highly intelligent but apart from that he’s just like any other normal teenage boy.
Luke found his first day adapting to school difficult as it was only a week after the Bane invasion. Luckily he had Maria to help him. As Maria had only just moved to the area they were both new to the school.
Luke and Maria met and befriended Clyde Langer on their first day at school. Together with Sarah Jane Smith, they discovered some of the teachers were Slitheen!
The Slitheen later returned and tried to kidnap Luke by posing as his real parents.
Luke is the only character apart from K9 and Sarah Jane to appear in an episode of Doctor Who. He has appeared in every episode of the Sarah Jane Adventures.

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