What To Watch Sunday: Vampire Diaries Vet Joins Tracker, Simpsons Goes Slasher, New Marshals, And More - TVLine

Michael Kovac/Getty Images for HISTORY; Mike Taing/CBS

Every day, TVLine’s What to Watch column spotlights new and returning English-language shows (and select movies) premiering or airing fresh episodes across broadcast, cable and streaming — organized below by release time and alphabetically within each slot.

On TV this Sunday: Michael Malarkey visits “Tracker,” a serial killer stalks “The Simpsons,” and a drone crash causes chaos on “Marshals.”

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Showtimes for October 18, 2026

1:00 PM
ET

Saturday Night Live UK

Peacock

James Norton hosts; The Streets performs.

8:00 PM
ET

Amish Revenge

Lifetime
MOVIE PREMIERE

A widowed Amish mother (Boti Bliss) takes in a handsome young man (Brigdon York) who claims to be homeless, only to discover that he isn’t who he says he is.

Mr. & Mrs. Christmas

Hallmark Channel
MOVIE PREMIERE

A holiday display expert (Brendan Penny) relocates with his children to a quaint town, where reviving its Christmas Market brings him together with a practical accountant (Pascale Hutton) hoping to prove she’s ready for a new leadership role.

Professor T

PBS

Season 5 premiere: Jasper’s new relationship is put to the test when a mysterious death arouses his suspicions.

The Real Housewives of Potomac

Bravo

Karen celebrates her return home with a party theme that no one can decode; Gizelle tries to restore her friendship with Tia.

The Simpsons

Fox

In a new “Treehouse of Horror” episode, all hell breaks loose on Halloween when a killer comes to Springfield and hacks their way through town.

8:30 PM
ET

Animal Control

Fox

Frank goes undercover at Roman’s new privatized animal control company, Pax Romana.

Marshals

CBS

The Marshals are sent to track three Broken Rock residents accused of shooting down a military test drone; tensions rise between federal authorities and tribal leadership after the drone crash takes the life of a Broken Rock member.

9:00 PM
ET

American Hostage

MGM+

Fred wrestles with selling the false immunity agreement to Tony over the air, taking the story back to 1972.

Maigret

PBS

Season 2 premiere: Maigret investigates a young woman’s death, putting himself directly in the path of people who will do anything to keep the truth hidden.

The Pet Cemetery Murders

HBO

Detectives make strides in Dorothy’s case, and an unlikely witness comes forward with a vexing admission; details emerge about Dorothy’s struggles with addiction and the mysterious deaths of her past husbands.

Universal Basic Guys

Fox

Darren becomes a summer camp lifeguard; Mark and Hank get into magnet fishing.

9:30 PM
ET

Grimsburg

Fox

Stan breaks bad to help Dr. Pentos sell illegal candy to students at the middle school; Flute mentors Otis for his first undercover operation.

Tracker

CBS

Colter gets hired to track down a woman who disappeared after an argument with her husband in a deserted Texas town; an unexpected reunion with an old friend (Michael Malarkey), leaves Reenie revisiting her past.

10:00 PM
ET

The Gold

PBS

Season 2 premiere: The police chase the other half of the stolen Brink’s-Mat gold when it resurfaces; in Tenerife, John Palmer’s successful timeshare business starts to attract unwanted attention.

Treasure Island