Glee, 8 p.m., channels 19 and 45: As Finn (Cory Monteith) tries to bring the spirit of Christmas cheer to the school, Artie (Kevin McHale) discovers that Brittany (Heather Morris) still believes in Santa Claus. As the teachers pick their secret Santas, a certain devious coach rigs the gift giving in her favor in “A Very Glee Christmas.” Matthew Morrison and Jane Lynch also star.
NCIS, 8 p.m., channels 7 and 12: Secrets arise when Joann Fielding (guest star Gena Rowlands), Gibbs’ (Mark Harmon) former mother-in-law, becomes a witness in a murder investigation, forcing Gibbs to revisit his unhappy past in ``Mother’s Day.’’ Rena Sofer, Adam Kaufman. Bryce Johnson and Leann Hunley also guest star.
Life Unexpected, 9 p.m., Channel 26: Summoned to the principal’s office, Baze and Cate (Kristoffer Polaha, Shiri Appleby) are stunned to learn that Lux (Britt Robertson) is failing her classes and must dramatically improve her grades or be expelled from school. After getting the rug pulled out from under her at the radio station, Cate begins looking for her next job, while Baze interviews for a position at his father’s firm in an effort to grow up in “Parents Unemployed.”
NCIS: Los Angeles, 9 p.m., channels 7 and 12: It’s beginning to look a lot like Christmas as holiday decorations go up around the courtyard, but Callen (Chris O’Donnell) and the team are focused on tracking down a Marine’s old explosive ordnance disposal unit after he is murdered by an exploding cell phone. LL Cool J, Linda Hunt and Peter Cambor also star in “Brimstone.”