Community (8pm, NBC) - The gang wander through Pierce's eerie mansion on Halloween in order to free him from his locked panic room. While looking for the code to open the room, they also uncover some of the house's secrets.
Parks and Recreation (8:30pm, NBC) - Leslie is forced to take part in a citywide emergency-response drill, and Ron fills in for her on "Pawnee Today."
Zero Hour (8pm, ABC) - A new series in which a sensible magazine editor (played by Anthony Edwards, right) is drawn into a centuries-old conspiracy with apocalyptic implications after his wife is kidnapped from her antique clock shop by a man who's searching for an ancient treasure map and who may be linked to Nazis. Sensing a heavy "Da Vinci Code" vibe already? You're right. Here's my review of "Zero Hour."
Glee (9pm, Fox) - Will and Emma get married on Valentine's Day, and former and current members of the New Directions reunite to celebrate the nuptials.
North Carolina Weekend (9pm, UNC-TV) - Two local segments are mixed in with this week's offerings: a profile of the Raleigh Little Theatre and a Bob Garner visit to Lilly's Pizza in Raleigh's Five Points neighborhood.
Scandal (10pm, ABC) - Fitz is still unsure about whom he can trust. Meanwhile, Olivia meets a charming stranger (hello, Scott Foley!) but she can't deny the chemistry she feels with Fritz. Also, the Gladiators help David when he finds himself in a sticky situation.
Elementary (10pm, CBS) - Holmes investigates after someone attacks Detective Bell, but the case takes an unexpected twist when the chief suspect is found dead.