What to Watch: December 21

'The Closer' (9PM, TNT) season 5 finale
Brenda's (recent Golden Globe and SAG Award nominee Kyra Sedgwick) life gets particularly complicated as the show closes out its fifth season. The return of Capt. Raydor (guest star Mary McDonnell) brings a tricky case to Brenda: A female police officer is a suspect when she denies that her husband was abusing her, even after he's shot by another cop answering a domestic disturbance call. Meanwhile, on the homefront, Fritz is running out of patience with the fact that Brenda's job always seems to take priority over him.'The Closer' (9PM, TNT) season 5 finale
Brenda's (recent Golden Globe and SAG Award nominee Kyra Sedgwick) life gets particularly complicated as the show closes out its fifth season. The return of Capt. Raydor (guest star Mary McDonnell) brings a tricky case to Brenda: A female police officer is a suspect when she denies that her husband was abusing her, even after he's shot by another cop answering a domestic disturbance call. Meanwhile, on the homefront, Fritz is running out of patience with the fact that Brenda's job always seems to take priority over him.

'The Sing-Off' – Boyz II Men perform as one a cappella group scores $100,000 and a recording contract (8PM, NBC) season 1 finale

'For the Love of Ray J' – Season one alum Danger is back. Sleep with one eye open, Ray J (9PM, VH1)

'Pawn Stars' – It's Christmastime at the pawn shop, and you know what that means? Probably people buying and selling stuff, just like they do the rest of the year (9PM, History)

'Men of a Certain Age' – Joe uses golf to try to bond with his son, but he's, ahem, playing in the rough, as he soon learns junior has some issues (10PM, TNT)

'World Chocolate Championship' – Can there really be a loser when so much chocolate is involved? (10PM, TLC)