SLEEPY HOLLOW: Ichabod Crane and Henry accidentally release a new beast. (Brownie Harris/Fox)

Network television is trying to turn the holiday season into an all-out bloodbath with “The Christmas Light Fight” (ABC at 9 p.m.), a competition series in which 20 families from across America will decorate their homes for Christmas in the most extreme way possible and compete for a $50,000 prize. Clark Griswold would love this.

The documentary “Six By Sondheim” (HBO at 9) is an intimate look at the prolific career of renowned Broadway lyricist and composer Stephen Sondheim. A story of his life and work, the film highlights his experiences writing six of his most celebrated songs: “Something’s Coming,” “Opening Doors,” “Send in the Clowns,” “I’m Still Here,” “Being Alive” and “Sunday.”

Pop heartthrobs Niall, Zayn, Liam, Harry and Louis perform their latest album, “Midnight Memories,” together onstage at the iHeartRadio Theater in Los Angeles on “One Direction iHeartRadio Album Release Party” (CW at 9). There will be hair flips, syncronized dance moves and fan-girls galore.

RETURNING SHOW: Jewel is the newest judge for the fourth season of “The Sing-Off” (NBC at 9), joining last season’s judging panel members Ben Folds and Shawn Stockton as they compare and rate a-cappella groups from across the country. New this season, the bottom two groups decided by the judges will face off in an “ultimate sing-off,” with each group performing the same song and trying to eliminate its opponents. Nick Lachey is back as host.

Ichabod enlists Henry Parrish to help him communicate with Katrina while she’s in purgatory on “Sleepy Hollow” (Fox at 9), but they unwittingly unleash a new evil.

For the conclusion of the miniseries “Bonnie & Clyde” (Lifetime, A&E and History at 9), Bonnie will push Clyde to commit ever-more-daring crimes to generate bigger headlines and gain them more fame. Then, the law closes in on the infamous gang.

Comedian Stephen Colbert and actor Ian McKellen stop by “The Late Show With David Letterman” (CBS at 11:35).

Television judge Simon Cowell and news anchor Megyn Kelly are on “The Tonight Show With Jay Leno” (NBC at 11:35), with musical musical guest MS MR.

Queen Latifah comes to “Jimmy Kimmel Live” (ABC at 11:35), along with a musical performance from Cage the Elephant.

— Rachel Lubitz