Tonight, NEW SPECIAL, 8:30 p.m. ET (NBC)
Why You Should Watch: Many of the voice-cast members of the 2016 “Trolls” movie reprise their roles in this new sequel of sorts. Poppy — voiced again by Anna Kendrick — becomes determined to restore holidays to her world, and specifically to the Bergens, who don’t have them. Justin Timberlake, Zooey Deschanel, James Corden, Kunal Nayyar (“The Big Bang Theory”) and Christopher Mintz-Plasse also return vocally. A number of the other creative talents who worked on the movie are back for this effort as well.