‘Pawn Stars’

REALITY. The Vegas pawn brokers are back, helping money-hungry customers receive appraisals on cool treasures — like a pair of Civil War diaries on tonight’s premiere — and then buying said treasures for way less than they’re worth. (That Rick Harrison drives a hard bargain.)

Season premiere, 10 p.m., History Channel

 

‘The Sing-Off’

REALITY. Christmas comes early for one singing group tonight when the finalists —Dartmouth Aires, Pentatonix, Urban Method — learn who walks away with that recording deal and $200,000 cash prize.

Season finale, 8 p.m., NBC

 

‘Rizzoli & Isles’

DRAMA. When a community activist is gunned down, guest star Bill O’Reilly — in town for a book signing — weighs in on the case in tonight’s mid-season premiere.

Mid-season premiere, 10 p.m., TNT

 

‘Scouted’

REALITY. Pretty people aspire to be America’s next top model, sans Tyra Banks showing them the way. But without smizing, why do we care?

Series premiere, 10 p.m., E!