Saturday on TV
NCIS: Los Angeles (7 p.m., Ch. 2): A member of the team disappears.
Harry Potter and the Sorcerer's Stone (7 p.m., Ch. 4): Daniel Radcliffe stars as the boy wizard in the first film of the franchise.
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Who Do You Think You Are? Actress Gwyneth Paltrow finds roots in Barbados while looking into her ancestral past.