Kelsea Ballerini Tags in For Kelly as The Voice Battle Rounds Begin

When Kelly Clarkson fell ill on the eve of taping this year's Voice Battles, producers had to think fast. Luckily country star Kelsea Ballerini answered the call, and is set to take Clarkson's chair for the Battle Rounds, beginning tonight.

Also today: Snowpiercer speeds into its two-hour season finale, Nat Geo bows a new reality competition from the producers of The Amazing Race, and the NCAA's Elite Eight hit the hardwood. Here's what's new and noteworthy on TV this Monday:

NEW EPISODE: Mentors Brandy, Dan + Shay, Darren Criss, and Luis Fonsi lend their talents to Teams Kelly, Nick, John and Blake as The Voice kicks off three weeks of Battle Rounds. Watch preview. 8:00 PM ET on NBC

NCAA BASKETBALL: Then there were eight. March Madness enters its final week with Night 1 of this year's two-night Elite Eight matchups (schedule subject to change due to COVID conditions):

• Houston vs. Oregon State at 7:15 PM ET on CBS
• Baylor vs. Arkansas at 9:57 PKM ET on CBS

SERIES PREMIERE: From the producers of The Amazing Race. Race to the Center of the Earth pits four teams of three against each other in a nonstop sprint across the globe for a $1 million prize. Watch preview. 10:00 PM ET on National Geographic

NEW EPISODE: Producers are promising "a surprise twist" on American Idol tonight as the season's Top 24 are revealed. 8:00 PM ET on ABC

SEASON FINALE: With Wilford (Sean Bean) assuming control of the train, tonight's two hour Snowpiercer season finale begins with those close with Layton (Daveed Diggs) growing anxious to learn their fates. Watch preview. 9:00 PM ET on TNT

SEASON FINALE: Just when it looks like the case is all but solved on Bulletproof, Bishop (Noel Clarke) tells Pike (Ashley Walters) and Tanner (Lindsey Coulson) about a hunch that turns everything on its side in the Season 3 finale. 8:00 PM ET on The CW

SPECIAL PRESENTATION: In the first of three Black Ink Crew: Confessions specials, the New York cast reunites to update fans on what's happened in their lives since the the show's most recent season ended nearly a year ago. 8:00 PM ET on VH1

SERIES PREMIERE: Nikki Glaser hosts the week-long series Hall of Flame: Top 100 Roast Moments, counting down Comedy Central Roasts' "best burns" culminating in the hottest moment in franchise history. Watch preview. 10:00 PM ET on Comedy Central

SEASON PREMIERE: Anthony Mackie (Falcon and the Winter Soldier) is Running Wild With Bear Grylls as the two embark on epic adventure in the Italian Dolomites. Watch a preview. 9:00 PM ET on National Geographic Channel

ENCORE PRESENTATION: In a special 9-1-1 flashback episode that first aired in 2019, we learn how Bobby (Peter Krause) came to join the LAFD. Watch promo. 8:00 PM ET on FOX

Mike Attebery is Senior Editor at Primetimer and the author of seven mystery thrillers. Follow him on Twitter at @mikeattebery.