Cesar Millan enters the ninth and final season of “The Dog Whisperer” (7 p.m. Saturday, Nat Geo Wild) with a four-episode trip to London. There he discovers that British canines can be as unruly as their American cousins, while their owners are just as delusional and frightened. Millan, as usual, behaves like the alpha human, straightening out the leash-holder’s fuzzy, frantic thinking, so the dogs can relax and behave.

After his stint across the pond, Millan will return to California, where his New Age, “take control of your life/take control of your dog” mantra is much more at home. Look for Millan’s encounters with such pack leaders as Kelsey Grammer, Jillian Michaels and Hugh Hefner before he ends his run and whispers no more.

• AMC celebrates the upcoming third season of zombie fantasy “The Walking Dead” with marathon presentations of the first two seasons (10:30 a.m. Saturday, 10:30 a.m. Sunday). The corpse grinding culminates with a “Talking Dead” (8 p.m. Sunday) special, featuring a sneak peek at the new season’s gore, a tour of the set and interviews with the cast and crew. A repeat of the pilot episode (9 p.m.) follows, presented in glorious black and white, apparently in keeping with the graphic novel that inspired this popular series.

Saturday’s other highlights

• On two unaired episodes of “NYC 22” (CBS): half-baked (7 p.m.), no turning back (8 p.m.).

• Major League Baseball (7 p.m., Fox).

• “My Cat From Hell” (7 p.m., Animal Planet) profiles Xena and Gigi. Both started out as cuddly kittens before transforming into annoying, dangerous pets.

• Jury selection on the fly on “The Firm” (9 p.m., NBC).

Saturday series

”America’s Got Talent” (7 p.m., NBC) … “Extreme Makeover: Home Edition” (7 p.m., ABC).

Out on a limb on “Law and Order: Special Victims Unit” (8 p.m., NBC) … Two episodes of “Ball Boys” (8 p.m. and 8:30 p.m., ABC).

Scheduled on “48 Hours Mystery” (9 p.m., CBS): a murder with cinematic overtones … A dog whisperer gets a permanent time-out on “Castle” (9 p.m., ABC).

Sofia Vergara hosts “Saturday Night Live” (10:30 p.m., NBC), featuring musical guest One Direction.