Sabrina Soto hosts “Halloween Block Party” (7 p.m., today, HGTV). Professional designers help three families decorate their homes for the trick-or-treat holiday, complete with scary themes, gourmet treats and something HGTV is calling “tablescapes.”

Like a recent Martha Stewart special on Hallmark, “Block” offers new ways to turn the simple joys of childhood into a needlessly expensive way for adults to keep up with the Joneses. Gosh, Halloween has become a night of suburban one-upmanship. Now that’s really scary!

“Block Party” also celebrates the 60th anniversary of Trick-or-Treat for Unicef, a long-running volunteer program that has raised more than $160 million for children around the world.

• “Mad Men” (9 p.m., Sunday, AMC) ends its fourth season with both Don and Peggy considering tempting, and potentially life-altering, offers.

The fourth year of “Mad Men” ends without the certainty of a season five, and as much as I would miss “Mad Men,” I half wonder whether this wouldn’t be the perfect time to end the series. The past season has been set in 1964-1965, a time when the popular culture was rounding the bend toward the upheaval of the late 1960s. It would be rewarding to see this smart show tackle some of the stereotypes of that period, but I’d hate to see Don’s agency start to look like the set of “Austin Powers.”

Among the stranger surprises of this season has been the decision to downplay the role of Don’s ex-wife, Betty. At times it seemed like January Jones was all but written out of the show. But this was more than compensated for by the greater focus on young Sally (Kiernan Shipka) as she enters a troubled adolescence. As I’ve written before, Don can break women’s hearts with abandon, but Sally remains perhaps the only female who can break his.

• “Rubicon” (8 p.m., Sunday, AMC) wraps up its freshman year as Will realizes a connection between the deaths of Truxton and Hadas.

• “Masterpiece Mystery” (8 p.m., Sunday, PBS) wraps up the three-part “Wallander” with an adaptation of “The Fifth Woman” by Henning Mankell, about a series of disturbing murders of older men possibly connected to war crimes far from Sweden.

• Victims and survivors of North Korea’s political prisons relate harrowing stories of endurance and escape in the film “Kimjongilia” (7 p.m., Sunday, Documentary Channel). First-person accounts are shown accompanied by a peculiar kind of interpretive dance that doesn’t always add to the film.

“Kimjongilia” also includes many clips of propaganda films and art from North Korea, arguably the most isolated and repressive place on Earth.

• “Nature” (7 p.m., Sunday, PBS) salutes Echo, a well-documented African Elephant who died in 2009 at age 65.

Today’s highlights

• Wisconsin hosts Ohio State in College Football action (7 p.m., ESPN).

• College kids stumble into a sadist’s evil game in the 2009 shocker “Kill Theory” (8 p.m., SyFy).

• Richard Gere and Joan Allen star in the international family film hit “Hachi: A Dog’s Tale” (8 p.m., Hallmark).

• Scheduled on “48 Hours Mystery” (9 p.m., CBS): A police coverup keeps the wrong man in prison for 26 years.

• Amy Poehler hosts “Saturday Night Live” (10:30 p.m., NBC), featuring musical guest Katy Perry.

Sunday’s highlights

• The new pre-school series “Dino Dan” (6 p.m., Nick Jr.) gets an evening premiere before settling into its 4 p.m. timeslot Monday.

• The Washington Redskins host the Indianapolis Colts on Sunday Night Football (7 p.m., NBC).

• Spectral investigations unfold on “Paranormal State” (8 p.m. and 8:30 p.m., A&E), followed by “Psychic Kids” (9 p.m.).

• Nucky’s brother Eli (Shea Whigham) makes a St. Patrick’s Day speech that ends in an uproar on “Boardwalk Empire” (8 p.m., HBO).

• Dexter finds a woman who may have seen too much on “Dexter” (8 p.m., Showtime).

• After an abduction, the only witness turns out to be blind on “CSI: Miami” (9 p.m., CBS).

• Holly’s faulty memory takes a toll on “Brothers and Sisters” (9 p.m., ABC).

Cult choice

Perhaps only director Billy Wilder, a refugee from Hitler’s Europe, could turn the rubble of postwar Berlin into a setting for a comedy as he did in his 1948 feature “A Foreign Affair” (7 p.m., today, TCM), starring Marlene Dietrich.

Saturday series

Very bloody room service on “CSI:NY” (7 p.m., CBS) … Reunions can be murder on “The Mentalist” (8 p.m., CBS) … Surf or die on “Law & Order: Los Angeles” (8 p.m., NBC) … Evidence of human trafficking on “Law & Order: SVU” (9 p.m., NBC).

Sunday series

Circling the Arctic on “Amazing Race” (7 p.m., CBS) … Obesity challenged on “Extreme Makeover: Home Edition” (7 p.m., ABC) … A airline owner takes off on “Undercover Boss” (7 p.m., CBS) … Susan takes a stand on “Desperate Housewives” (8 p.m., ABC).