Thomas Jane as Detective Josephus Miller in the futuristic Syfy drama "The Expanse." (Syfy/Rafy/Syfy)

(All times Eastern.)

On “Supergirl” (CBS at 8 p.m.) Cat’s email account gets hacked, exposing some damaging missives, and Kara’s aunt Astra challenges what Kara thinks she knows about her mother.

Adapted from Arthur C. Clarke’s classic science-fiction novel, the three-night miniseries “Childhood’s End” (Syfy at 8) tells the story of an alien presence that arrives on Earth to create what becomes a troubling Utopia.

Season 6 of “Love & Hip Hop: New York” (VH1 at 8) launches with a new crew of female rappers, including Remy Ma.

FINALE WATCH: The remaining finalists perform on “The Voice” (NBC at 8) in Part 1 of the reality singing competition’s Season 9 finale.

The documentary “Very Semi-Serious: A Partially Thorough Portrait of New Yorker Cartoonists” (HBO at 9) offers a behind-the-scenes look at the publication process behind the New Yorker’s iconic cartoons.

It’s baby’s first Christmas on “Jane the Virgin” (CW at 9), and Jane and Rafael disagree on how Mateo should celebrate. Michael’s probe of Sin Rostro leads him to pursue Luisa’s mother, and Rogelio gets an intern.

“The Expanse” (SyFy at 10) begins its two-night premiere. The futuristic series stars Thomas Jane as a detective who chases leads across the solar system on a missing-person case that turns into something more sinister.

In the holiday special “The Last Alaskans: Holiday Memories” (Animal Planet at 9), the few remaining residents of the Arctic National Wildlife Refuge celebrate off the grid. Heimo and Edna Korth, familiar to those who have seen “The Last Alaskans,” search for the perfect Christmas tree, while another resident cooks a traditional Alaskan meal, 300 miles from the nearest grocery store.

“Adele Live in New York City” (NBC at 10) features the singer’s recent one-night performance at Radio City Music Hall.

It’s pastry week on “The Great Holiday Baking Show” (ABC at 10) and the contestants are tasked with making breakfast pastries and a festive recipe that’s one of judge Mary Berry’s favorites.

“The Late Show With Stephen Colbert” (CBS at 11:35) hosts actress Jennifer Lawrence and historian Doris Kearns Goodwin. Sleater-Kinney plays.

Actor Oscar Isaac and American Ballet Theatre’s Misty Copeland visit “Jimmy Kimmel Live” (ABC at 11:35). Jeff Lynne’s ELO performs.

Tina Fey and actor Dane DeHaan will be on “The Tonight Show Starring Jimmy Fallon” (NBC at 11:35). Kenny Rogers is the musical guest.

Bethonie Butler