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Tommy Knight (born 22nd January 1993) plays Luke Smith in The Sarah Jane Adventures and Doctor Who.
He has presented a behind the scenes video of the Season 4 finale, available here, and a CBBC Extra behind the scenes look at the filming of season 2 of SJA, available here.
He has also appeared on various CBBC programmes in and out of character, most notably Blue Peter and TMi on two occasions.