“LUTHER” — Idris Elba is back on the beat as tormented Detective Chief Inspector John Luther. The final four-part chapter of this blistering British drama series is darker than ever as Luther splits time between two horrific crime investigations. But, hey, on the bright side, he gets a new girlfriend (Sienna Guillory). 7 p.m. Tuesday, BBC America.
Other good bets
TONIGHT: Will you have an appetite for this season’s new TV shows? Get a sample taste tonight via the “ABC Fall Preview Special Presented by The Chew.” Just be careful to guard against indigestion. 6, ABC.
TONIGHT: “TV’s Funniest of the Funniest: A Paley Center for Media Special” is a long-winded title for a clip show in which sitcom stars — including Michael J. Fox and Betty White — talk about their favorite moments in TV comedy. 8, NBC.
TONIGHT: Ryan Seacrest, Paula Abdul, Backstreet Boys, Lee Ann Womack and Matthew Morrison are among the celebrities scheduled to appear on the “MDA Show of Strength Telethon.” The muscular dystrophy find-raiser, once an all-day affair, is now down to two hours. 8, ABC.
MONDAY: Brace yourself for another hilarious verbal beat-down as James Franco takes the hot seat for the “Comedy Central Roast.” The guest list includes Bill Hader, Jonah Hill, Sarah Silverman and others. 10 p.m.,Comedy Central.
TUESDAY: “Cold Justice” is a new true-crime series from producer Dick Wolf (“Law & Order”). It follows former prosecutor Kelly Siegler and veteran crime scene investigator Yolanda McClary as they attempt to crack long-unsolved murder cases in small towns across the country. 10 p.m., TNT.
WEDNESDAY: All good things come to an end — yes, even “Futurama.” The loony sci-fi cartoon series caps things off with the long-anticipated wedding between Fry and Leela, along with plenty of slapstick violence, of course. 10 p.m., Comedy Central.
WEDNESDAY: Love is all around for tonight’s “Hot in Cleveland,” which reunites five actresses from “The Mary Tyler Moore Show” — Valerie Harper, Cloris Leachman, Georgia Engel, Betty White and Mary herself. 10 p.m., TV Land.
THURSDAY: It’s more shlocky fun as “Ragin’ Cajun Redneck Gators” take to the screen. Some toxic moonshine turns normal alligators into scary mutants, which then wreak havoc on the Louisiana bayou. 9 p.m., Syfy.
FRIDAY: Queen Latifah hosts and narrates “Teach.” It’s a two-hour special that explores America’s education system through the eyes, minds and hearts of four public-school instructors. 7 p.m.,CBS.
SATURDAY: Get a big dose of crazy on “David Tutera: Unveiled.” It’s a reality series that follows the event planner as he organizes epic, over-the-top parties for bratty bridezillas and ditsy divas. 9 p.m., WEtv.