“Santa Claus Is Comin’ to Town” (8 p.m., ABC): You better watch out, you better

“Santa Claus Is Comin’ to Town” (8 p.m., ABC): You better watch out, you better not cry. Another classic holiday special returns tonight as “Santa Claus Is Comin’ to Town” again delves into the early days of jolly Kris Kringle.

“Law & Order” (10 p.m., NBC): On a pivotal episode of “Law & Order: Special Victims Unit,” Benson struggles with painful flashbacks of the assault she suffered last season. It happens while working a case tied to a missing Marine who had been impregnated by a rapist.

“Explorer: Marijuana Nation” (10 p.m., National Geographic Channel): This is the sort of agribusiness the government frowns on: marijuana being raised in greater bulk and with greater potency, spawning a shadowy multibillion-dollar industry that some analysts believe eclipses corn as the nation’s leading cash crop. National Geographic Channel’s “Explorer: Marijuana Nation” investigates this growth industry, including the criminal elements that sustain it, the efforts by law enforcement agencies to contain it, and the health costs (and, some argue, health benefits) of the weed that seemingly can’t be snuffed out.

“Shatner’s Raw Nerve” (10 p.m., Biography Channel): Long before now, it became clear that William Shatner is game for anything. Drama, comedy, singing (arggg!), hosting, writing, doing those nutty commercials for Priceline.com. And now he’s got a talk show, “Shatner’s Raw Nerve.” First up: Valerie Bertinelli, airing Tuesday at 10 p.m., followed by Tim Allen at 10:30 p.m. Ahead: Drew Carey, Jimmy Kimmel, Judge Judy and Leonard Nimoy, among others. But often, Shatner is more fun to watch than his guest.