Under the Dome (10 p.m., CBS) - In the series finale, a final attempt is made to keep infected townspeople from impacting the outside world as the dome comes down.
Also on . . .
Longmire (Netflix) - This excellent show rises from the ashes of its A&E cancellation to triumphantly debut all 10 episodes of its fourth season on the streaming channel today. (In fact, Seasons 1-3 are streaming right now, too, for those who need to catch up – and if you haven't watched it, you need to catch up.)
Beauty and the Beast (8 p.m., CW) - In the Season 3 finale, Vincent and Cat must work together to defeat Liam, who will do whatever it takes to expose Vincent as a beast.
A Chef's Life (9:30 p.m., UNC-TV) - Vivian learns the secrets of Gramma Hill's canned peaches. Later, the family takes a Thanksgiving in July photo, and a mix-up leaves the team scrambling.