What To Watch: Matthew Morrison Is The Grinch, I Can See Your Voice Wraps, The Challenge Returns And More

Ashley Garcia: Genius In Love

Series finale: Ashley has visions of a not-so-festive future dancing in her head on Christmas Eve. (Officially cancelled.)

The Big Show Show

Series finale: Cassy steps up as Mrs. Claus after an injury forces the Big Show to cease all Santa duties. (Officially cancelled.)

The Surgeon's Cut

The four-part docuseries follows four groundbreaking surgeons with specialties in fetal medicine, neurosurgery, transplant surgery, and cardiology.

The Challenge: Double Agents

Season 36 premiere: As 30 elite agents battle one another, a cutthroat plan is devised to take down former champions. (Read preview.)

Dr. Seuss' The Grinch Musical!

Glee vet Matthew Morrison plays the curmudgeonly Grinch in this taped performance from London's Troubadour Theatre. (Get NBC midseason dates.)

The Great Christmas Light Fight

Season 8 premiere: Four families face off for the $50,000 prize; judges Carter Oosterhouse and Taniya Nayak return. (For Life follows at 10 pm.)

The Masked Singer

The final three perform never-before-heard holiday songs; already unmasked celebs sing their favorite holiday jingles. (Latest clues and guesses!)

The Greatest Holiday Commercials Countdown

Entertainment Tonight's Kevin Frazier and Keltie Knight run down the 12 best holiday commercials of all. time. (Get CW midseason dates.)

I Can See Your Voice

Season 1 finale: Guests panelists include Katharine McPhee, Joel McHale and Niecy Nash. (Not yet renewed; who's hosting Fox's NYE countdown?)

SEAL Team

Bravo Team must adjust to its very new dynamic. (Meet Bravo Team's new canine hero; who was Performer of the Week?)

🎄 ON THIS DAY IN TV HISTORY 🎄
On Dec. 9, 1965, A Charlie Brown Christmas -- the first TV special based on the Peanuts comic strip -- made its debut on CBS.