8 pm NCIS (CBS) | Fall finale: Gibbs and the team investigate a mysterious illness striking children from military families; Director Vance’s estranged father-in-law (Ben Vereen, Roots) pays a surprise visit.
8 pm The Biggest Loser (NBC) | The competition goes from teams to singles, and contestants face a double elimination… which means twice the crying.
9 pm NCIS: LA (CBS) | Fall finale: The team searches for a motive when a senator’s daughter (Gossip Girl’s Michelle Trachtenberg) is attacked; Kensi receives the perfect holiday gift from one of her co-workers. (Is it a Snuggie? Because those things are awesome.)
9 pm Little People, Big World (TLC) | Season finale: Jeremy and Molly return to school, Zach moves into a new house and Matt and Amy question their future together. (Not yet renewed.)
10 pm Person of Interest (CBS) | Fall finale: Flashbacks to Finch’s adolescence provide insight into his creation of The Machine, and Reese makes a big decision.
10 pm What Would You Do? (ABC) | Season finale: Host John Quiñones presents the season’s final social experiment (and, as usual, my faith in humanity is restored by the end of the hour).
10 pm Chopped (Food Network) | Contestants must use Spanish ingredients in their dishes.
10 pm Real Husbands of Hollywood (BET) | Trina tries to book Kevin for the ultimate public appearance: hosting the Oscars. (Note: The season finale will air at 10:30 pm.)
Hit the comments with your must-see picks from tonight’s lineup!Follow @rebeccaiannucci