Up All Night (8pm, NBC) - Two new back-to-back episodes tonight. In the first, Reagan and Chris want to show Amy snow, but their plan goes awry. Elsewhere, Scott helps Ava buy Christmas gifts on a budget. At 8:30, a flashback to Chris and Reagan's disastrous wedding, which featured big revelations from Ava and Scott.
Glee (9pm, Fox) - In an episode that is intended as a tribute to the 2003 film "Love Actually," Sam and Brittany try to live their lives to the fullest before they Mayan apocalypse, and Jake and Puck spend Hanukkah together.
Person of Interest (9pm, CBS) - Reese's latest case becomes personal after he realizes that he's going after the sister of a soldier who was killed in action. Meanwhile, the FBI closes in on Reese.
Beauty and the Beast (9pm, CW) - Cat must search for a date for the wedding of her dad (Rob Stewart). Meanwhile, Tess and Joe share a romantic moment.
Scandal (10pm, ABC) - Olivia provides assistance to the vice president, while one of Olivia's staffers deals with a severe betrayal. Also, Cyrus uncovers the truth concerning James' mysterious investigation. Missing from this ABC episode is description is the following: "Huck!! What the heck, dude!?"
Elementary (10pm, CBS) - Holmes investigates when a supposedly unbreathable bank vault is broken into by thieves. Later, Sherlock meets Watson's family and defends her choice of becoming a sober companion.