1) “One Last Time: An Evening With Tony Bennett and Lady Gaga,” 8 p.m., CBS. Alzheimer’s disease has taken most of Bennett’s memories, but he retains songs perfectly. On his 95th birthday, he had what’s expected to be his final public concert. In Radio City Music Hall, his friend Lady Gaga did four potent jazz/pop songs, then brought him on. (They’re shown here at a previous show.) Backed by gifted musicians – his quartet, her quintet and an orchestra – both soared. The result is one of TV’s finest hours.
2) “The Waltons’ Homecoming,” 8-10 p.m., CW. Back in 1971, CBS debuted “The Homecoming,” with Earl Hamner slightly fictionalizing his Depressiontime boyhood in Virginia. That brought praise, Emmy nominations and the “Waltons” series. Fifty yeats later, it’s been remade, with Bellamy Young (“Scandal”) as Olivia Walton, hoping her husband can make it home on Christmas Eve. The first few minutes seem a tad stiff, but the rest has warmth, depth and deep emotion.
3) “The Hot Zone: Anthrax,” 9-11 p.m., National Geographic; continues Monday and Tuesday. Shortly after 9/11, lethal anthrax was sent by mail. This three-night mini-series slowly re-tells a gripping story. Harry Hamlin offers a cartoonish version of Tom Brokaw, but Daniel Dae Kim is solid as an FBI investigator and Tony Goldwyn is amazing. Past roles have put him in the White House and on the moon; now he’s brilliant as a smart-but-strange scientist who says a colleague may be the culprit.
4) “Disney Magical Christmas Celebration” and “The Great Christmas Light Fight,” 7 and 9 p.m., ABC. Here’s a four-hour holiday spree. First is music from the Disney Parks. Julianne Hough and Ariana DeBose do a medley and host with Julianne’s brother Derek. Also performing are Gwen Stefani, Brett Eldredge, Norah Jones, Jimmie Allen, Kristin Chenoweth, Darren Criss and more. Then we get a flashy-homes competition with “Light Fight,” which continues Monday and Thursday.
5) ALSO: Tonight’s 8 p.m. slot is overloaded. BET has the Soul Train Awards and BBC America has a new “Doctor Who” movie. Lifetime’s “Miracle in Motor City” has likable stars (including Tia Mowry and Smokey Robinson), but a lame story. And TBS and the Cartoon Network have the opener of a four-part competition: “Harry Potter: Hogwarts Tournament of Houses.”