On TV this weekend
CSI: NY, 9 p.m., CBS Two different murder victims are killed with a very unusual weapon. We keep getting accused of spoiling shows, so we won't tell you it's a computer printer.
Arrow, 9 p.m., CW This show turned out pretty well, so now you can watch the pilot all over again, without that pesky sense of dread about another superhero getting the hackneyed writer treatment.
SEASON PREMIERE Merlin, 10 p.m., SyFy Alexander Vlahos shows up as Mordred, who just may be a problem for Camelot. Arthur may want to meet this guy.
Over/Under, 10 p.m., USA A day trader loses his job because of his gambling problem, so he becomes a bookie. Makes perfect sense. This movie is actually the pilot for a show that didn't get picked up, even though they liked the pilot enough to show it. Go figure.
SEASON PREMIERE Portlandia, 10 p.m., IFC A series so nice, they're premiering it twice: Two episodes about the hip, hilly, misty, liberal paradise. Kind of the opposite of Florida.
SEASON PREMIERE Pit Boss, 9 p.m., Animal Planet Shorty and his pitbulls return, as opposed to MTV, where Pitbull's shorties return.
SEASON FINALE Redneck Island, 9 p.m., CMT The redneckiest of them all wins $100,000 tonight. Or as the rednecks call it, 50,000 Powerball tickets.
SEASON PREMIERE The Biggest Loser, 8 p.m., NBC Just in time for your New Year's resolution to lose all that blubber you packed on during the holidays, fatso.
SEASON PREMIERE Rachael vs. Guy: Celebrity cook-Off, 9 p.m., Food There's no way a kitchen packed with Gilbert Gottfried, Dean McDermott, Kathy Najimy, Carnie Wilson, Hines Ward, and Johnny Weir passed OSHA codes.
SEASON PREMIERE Downton Abbey, 9 p.m., PBS (check local listings) The British class-system equivalent of Mad Men returns for a third season of thumbing its nose at network TV dramas that can't seem to realize people will become devotees of a show that has fully realized characters and plot.
An Amish Murder, 9 p.m., Lifetime Neve Campbell plays a woman returning to her former Amish community to investigate a series of murders. Unlike the Scream series, she won't have to worry about the killer contacting her with a succession of creepy phone calls.
— Joshua Gillin firstname.lastname@example.org