(All times Eastern.)
The Big Bang Theory (CBS at 8) On the midseason finale, Leonard gets a Christmas letter from his brother that makes him self-conscious about his achievements.
Mom (CBS at 9) Christy and Bonnie support Marjorie after her husband suffers a stroke.
Million Dollar Listing: Los Angeles (Bravo at 9) Madison brings Cody to meet his family and asks a big question.
Life in Pieces (CBS at 9:30) Tyler finds out that his new girlfriend is also Sophia's fourth-grade teacher.
Top Chef (Bravo at 10) Chef Alex Seidel brings the contestants to his farm to study up on farm-to-table cooking.
Olaf's Frozen Adventure (ABC at 8) A family-friendly animated short film featuring characters from "Frozen."
Showtime at the Apollo: Christmas (Fox at 8) Steve Harvey hosts this showcase in which Snoop Dogg, Boyz II Men, DMX and Fifth Harmony perform Christmas songs.
Taraji's White Hot Holidays (Fox at 9:02) A holiday variety special with guests including Ciara, Fergie, Taye Diggs and Jay Pharoah.
Conan (TBS at 11) Jack Black, Kate Hudson.
Daily Show (Comedy Central at 11) Niecy Nash.
Colbert (CBS at 11:35) Adam Driver, John Early, Jon Batiste.
Kimmel (ABC at 11:35) Will Smith, Pharrell Williams, N.E.R.D.
Fallon (NBC at 12:05) Kevin Hart, Hailee Steinfeld.
Corden (CBS at 12:37) Hugh Jackman, John Cena.
Meyers (NBC at 1:07) Laura Dern, Fergie.