The following is a list of every new TV episode airing on December 21, 2017. Titles are listed by time and then sorted alphabetically.
3/2 AM:
- 3/2 AM: Black Lake (Shudder, Series Premiere)
- 3/2 AM: Circus Kid (Sundance Now, Special)
- 3/2 AM: Peaky Blinders (Netflix, Season 4 Premiere)
7/6 PM:
- 15: A Quinceañera Story – Ashley (HBO, Special)
8/7 PM:
- Alaska: The Last Frontier Christmas (Discovery Channel)
- Bunsen is a Beast (Nicktoons)
- Great News (NBC, Back-to-Back Episodes)
- Impact Wrestling: Best of Impact Wrestling Part 1 (POP)
- Inside the Actors Studio: Kristen Wiig (Bravo, One-Hour Special)
8:30/7:30 PM:
- Harvey Beaks (Nicktoons)
- Young Sheldon (CBS, Season 1 Fall Finale)
9/8 PM:
- American Pickers (History Channel)
- The Family I Had (ID, Two-Hour Special)
- The First 48 (A&E)
- Flip or Flop Fort Worth (HGTV)
- Million Dollar Listing: Los Angeles (Bravo)
- Mom (CBS, Season 5 Fall Finale)
- My Floating Home (FYI)
- Mysteries at the Museum (Travel Channel)
- Tamar & Vince (WE)
- Van Helsing (Syfy)
9:30/8:30 PM:
- Life in Pieces (CBS, Season 3 Fall Finale)
- My Floating Home (FYI)
10/9 PM:
- Beat Bobby Flay (Food Network)
- Beerland (Viceland)
- The Carbonaro Effect (truTV)
- Containables (DIY)
- Damnation (USA Network)
- Ghost Wars (Syfy)
- House Hunters (HGTV)
- Late Nite Eats (Cooking Channel, Season 1 Finale)
- The Menendez Murders: Erik Tells All (A&E)
- S.W.A.T. (CBS, Season 1 Fall Finale)
- Sheffield Real Estate (FYI)
- Top Chef (Bravo, 75-Minute Episode)
10:30/9:30 PM:
- House Hunters International (HGTV)
- It’s Suppertime! (Viceland)
- Sheffield Real Estate (FYI)
11/10 PM:
- Desus & Mero (Viceland)
- Nick Cannon Presents: Wild ‘n Out (MTV)
- Prefabulous (FYI)
- The Rundown with Robin Thede (BET)
- Superstition (Syfy)
11:30/10:30 PM:
- The Comedy Get Down (BET)
- The Untitled Action Bronson Show (Viceland)