Tuesday on TV: It’s Christmas at the hospital on ‘This Is Us’

It's a bit early, but it's Christmas tonight on "This Is Us" (8 p.m., NBC/Ch. 5).

It's Christmas Eve, actually, and Kate has an attack of appendicitis. So the entire family is at the hospital.

In the past, the Pearsons run into Dr. K — who delivered the babies — who is himself a patient. And he's all alone.

In the present, Kevin celebrates Hanukkah with Sloane and her family; Kate continues to pursue her big surgery; and someone from William's past reappears in his life.

Elsewhere on TV …

• Men's college basketball (6 p.m. P12N): Utah Valley at Utah

• "NCIS" (7 p.m., CBS/Ch. 2): The team looks into hreats against a congresswoman.

• "The Middle" (7 p.m., ABC/Ch. 4): Sue tries to talk Axl into reconciling with the family.

• "The Voice" (7 p.m., NBC/Ch. 5): America votes to eliminate two contestants.

• "Brooklyn Nine-Nine" (7 p.m., Fox/Ch. 13): Jake and Holt help Captain C.J. with a big case.

• "The Flash" (7 p.m., CW/Ch. 30): Barry heads for Earth-3 to get advice from Jay Garrick on how to stop Savitar.

• "Good Behavior" (7 and 8 p.m., TNT): Letty rejoins Javier on the road.

• "American Housewife" (7:30 p.m., ABC/Ch. 4): Oliver secretly takes dancing and manners lessons to get a girl to accompany him to the Westport Cotillion.

• "New Girl" (7:30 p.m., Fox/Ch. 13): Jess is still trying to figure out what her feelings for Robby really are.

• "Bull" (8 p.m., CBS/Ch. 2): Bull helps his ex-wife's defense in a wrongful death lawsuit, but things get complicated.

• "Fresh Off the Boat" (8 p.m., ABC/Ch. 4): Jessica gets called for jury duty, and she campaigns to be the foreperson.

• "Scream Queens" (8 p.m., Fox/Ch. 13): Zayday and Chamberlain concoct a plan that could reveal the origins of the Green Meanie killer.

• "No Tomorrow" (8 p.m., CW/Ch. 30): Evie turns to Timothy for help after a secret rocks Xavier's world;.

• "Knocked Up" (8:02 p.m., Lifetime): This new reality shows follows young women who have unplanned pregnancies. In the premiere, a reformed party girl decides to raise the baby on her own when the father refuses to get involved.

• "The Real O'Neals" (8:30 p.m., ABC/Ch. 4): Kenny reluctantly joins Jimmy's wrestling team and finds surprising success.

• NBA (8:30 p.m., ROOT): Utah Jazz at Los Angeles Lakers

• "NCIS: New Orleans" (9 p.m., CBS/Ch. 2): A member of the U.S. Navy Band is murdered in her home.

• "Marvel's Agents of S.H.I.E.L.D." (9 p.m., ABC/Ch. 4): S.H.I.E.L.D. and Ghost Rider work together to battle a villain.

• "Chicago Fire" (9 p.m., NBC/Ch. 5): Casey and Dawson run into a problem when they apply to adopt Louie

• "Teen Wolf" (10 p.m., MTV): Scott and Liam try to protect the lacrosse team from an attack; Lydia searches for clues in Stiles' disappearance.

• "Leah Remini: Scientology and the Aftermath" (10 p.m., A&E): Leah talks to he former head of Scientology's Office of Special Affairs.

• "Sweet Vicious" (11 p.m., MTV): Ophelia goes undercover in a sorority that is brutally hazing pledges.

• "Aftermath" (11 p.m., Syfy): With a family member on the verge of death, the Copelands take desperate measures.

• "Shooter" (11 p.m., USA): Nadine investigates the Ukrainian connection, which places her on the conspirators' radar.

• "Drunk History" (11:30 p.m., Comedy Central): DJ Steve Dahl sparks an anti-disco rio; a rivalry between two actors turns violent. (Season finale)