WILL & GRACE -- "Papa Mia" Episode 302 -- Pictured: (l-r) Sean Hayes as Jack McFarland, Eric McCormack as Will Truman -- (Photo by: Chris Haston/NBC)

THE GOOD PLACE -- "A Chip Driver Mystery" Episode 406 -- Pictured: (l-r) Kirby Howell-Baptiste as Simone Garnett, Brandon Scott Jones as John Wheaton -- (Photo by: Colleen Hayes/NBC)

A MILLION LITTLE THINGS - "unleashed" - Gary's growing tension with Maggie comes to a head as she accidentally lets Colin out while she's on the phone with Eric. Meanwhile, Delilah does a podcast about suicide, which helps her open up to Andrew, on a new episode of "A Million Little Things," airing THURSDAY, OCT. 31 (9:01-10:01 p.m. EDT), on ABC. (ABC/Jack Rowand)ROMANY MALCO, CHRISTINA MOSES, CHANDLER RIGGS, DAVID GIUNTOLI, JAMES RODAY, ALLISON MILLER

PERFECT HARMONY -- "HALLE-BOO-YAH" Episode 106 -- Pictured: Bradley Whitford as Arthur Cochran -- (Photo by: Justin Lubin/NBC)

GREY'S ANATOMY - "Whistlin' Past the Graveyard" - Alex is hoping to impress investors at Pac-Gen North, but when he hears disturbing news about skeletons on the construction site grounds, he enlists Richard to help with distraction tactics. Teddy feels the pressure to be super-mom after tasking herself with creating original Halloween costumes for Allison and Leo, while Meredith fears she won't make it home in time for trick-or-treating with her kids. Elsewhere, Jackson tends to a pediatric patient who is upset she is spending her Halloween in a hospital on "Grey's Anatomy," THURSDAY, OCT. 31 (8:00-9:01 p.m. EDT), on ABC. (ABC/Kelsey McNeal)CAMILLA LUDDINGTON

MODERN FAMILY - "The Last Halloween" - Phil is determined to finally scare Claire on Halloween. Meanwhile, for the first time, Gloria is feeling self-conscious about her age when someone correctly assumes she is Jay's wife; and Mitch and Cam head to the WeHo Halloween Carnival after Lily decides to go to her first Halloween party alone on "Modern Family," WEDNESDAY, OCT. 30 (9:00-9:31 p.m. EDT), on ABC. (ABC/Tony Rivetti)RICO RODRIGUEZ

"All Along the Watchtower: Part 1" -- Jason pleads to be sent to help Ray and Clay, who are abroad on a mission to protect a U.S. ambassador (Khandi Alexander) when their compound is attacked, on SEAL TEAM, Wednesday, Oct. 30 (9:01-10:00 PM, ET/PT) on the CBS Television Network. Pictured L to R: David Boreanaz as Jason Hayes and Tyler Grey as Trent Sawyer. Photo: Aaron Epstein/CBS ©2019 CBS Broadcasting, Inc. All Rights Reserved

Riverdale -- "Chapter Sixty-One: Halloween" -- Image Number: RVD404a_0056.jpg -- Pictured (L-R): Eli Goree as Munroe, KJ Apa as Archie and Ajay Friese as Eddie -- Photo: Diyah Pera/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

THE GOLDBERGS - "A 100% True Ghost Story" - Beverly scores a bargain on four paintings. Once they make it home, she and Adam determine something supernatural is causing them to be destroyed. Much to Murray's dismay, they call a psychic for help. Meanwhile, Barry decides to throw a huge "Rocky Horror Picture Show"-themed party against Erica's wishes. Their confrontation leads to a visit to the dean's office. "Rocky Horror Picture Show" alum Barry Bostwick guest stars as Professor Majors on the sixth episode of season seven of "The Goldbergs," WEDNESDAY, OCT. 30 (8:00-8:30 p.m. EDT), on ABC. (ABC/Mitch Haaseth)JEFF GARLIN, STEPHNIE WEIR, STEVE GUTTENBERG, SEAN GIAMBRONE