The Flash / 8:00pm (50) Susan Walters guest stars as the medically savvy mother of Caitlin (Danielle Panabaker), who needs Mom’s help in grasping her transformation, in “Monster.” The reunion doesn’t go well, though, since the elder woman has something less than a personal touch in dealing with her daughter. Barry (Grant Gustin) wants to join Julian (Tom Felton) in investigating the latest meta-human to cause problems in Central City.
American Housewife / 8:30pm (7) Already at a premium, Katie’s (Katy Mixon) holiday spirit lessens even more when Viv (Leslie Bibb) recruits her to assist with the Christmas pageant at school in the new episode “Krampus Katie.” Greg’s (Diedrich Bader) effort to teach Taylor and Oliver (Meg Donnelly, Daniel DiMaggio) the true yuletide meaning through a nursing-home visit backfires.
The Voice / 9:00pm (4) Last time, it was former “Curly Sue” actress Alisan Porter. Who will it be this time? The winner of Season 11 is declared in the “Live Finale, Part 2” episode, but the show won’t be only about that moment — since any season finale of this competition typically is a starpacked affair filled with “name” guest performers. Coaches and judges Miley Cyrus, Alicia Keys, Adam Levine and Blake Shelton make their last assessments of the finalists.
Rock the Troops / 9:00pm (Comedy Ch) Much in the style of those vintage USO telecasts with master of ceremonies Bob Hope, Dwayne “The Rock” Johnson plays host for this new two-hour tribute to the men and women of America’s armed services, from the historic Joint Base Pearl Harbor-Hickam. Celebrities scheduled to appear include Kevin Hart, Jack Black, Matthew McConaughey, Katharine McPhee, Terry Crews, Keegan-Michael Key and, on tape, George Clooney.
Adam Levine is among the judges in “The Voice” Tuesday on NBC.