Doctor Who Our hero (Peter Capaldi) is in dire straits in the first half of the sci-fi series' two-part season finale. 9 p.m. BBC America
The Last Kingdom The Saxons prepare for battle against the Danes as this drama set in medieval Britain ends its first season. 10 p.m. BBC America
All-Star Gingerbread Build Ron Ben-Israel and Jonathan Scott go up against Duff Goldman and Drew Scott in a contest to create large but still edible gingerbread houses in this new special. 8 p.m. Food Network, HGTV
Christmas Cookie Challenge A $10,000 prize is on...