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ADDITIONAL NOTES: series finale aired on 1/27/12
DESCRIPTION: (from NBC's press release, November 2011) The returning series "Who Do You Think You Are?" makes its season debut on February 3 (8-9 p.m. ET). "Chuck" will have its two-hour series finale on January 27th (8-10 p.m. ET). "Grimm" (9-10 p.m. ET) and "Dateline NBC" (10-11 p.m. ET) remain in the respective time periods.