The Voice Dolly Parton mentors the artists and performs in this new results episode. 8 p.m. NBC
The Flash Mark Hamill ("Star Wars") reprises the role of the Trickster — which he first played on the original 1990s "Flash" series — in the new episode. 8 p.m. KTLA
The Muppets Mindy Kaling guest stars and Echo-smith performs in this holiday episode of the comedy series. 8 p.m. ABC
Scream Queens In the two-hour season finale, the identity of the Red Devil is revealed. 8 p.m. Fox
Chopped Junior Four new junior chefs work to...