He who demands the attention of young girls commands the attention of the world — or at least the advertising world. For those young ladies tend to go shopping and will soon grow up to head households and make the fateful purchasing decisions that result in the rise and fall of many a brand.

This is why Justin Bieber, a seemingly insipid and not-yet-shaven singing sensation is a very, very big deal. Hot off a hit movie and a Grammy appearance, the Canadian-born pop star returns to guest star on “CSI” (8 p.m., CBS) as the troubled teen Jason McCann.

He’s not the first young or youngish performer to cameo on “CSI.” Over the years the show has featured guest-starring roles featuring musicians Taylor Swift, John Mayer and Travis Barker from Blink 182.

• The war in Afghanistan probably doesn’t get the media attention it deserves. But you can’t say it hasn’t inspired strong documentaries. Last fall National Geographic broadcast “Restrepo,” a film later nominated for an Oscar. Now HBO offers “The Battle for Marjah” (8 p.m., HBO) a similarly intimate look at Marines in combat.

Filmmaker Ben Anderson spent two months with Marines during last year’s U.S. military offensive in an attempt to seize territory and the initiative from the Taliban in the hostile Helmand province. We see Marines facing gunfire and discovering and defusing roadside bombs. They also interact with locals whose response ranges from affection to hostility by way of ambivalence. Their allies in the Afghan police and military prove problematic.

Anderson spends enough time with the Marines to see them gain their initial military objective, only to see their company riddled by casualties over months of occupation. The decision to take Marjah and its role in the overall strategy is not for these men to judge or second-guess. As one survivor observes, “Marines fight battles, they don’t fight wars.”

Tonight’s other highlights

• Round three of the Los Angeles eliminations on “American Idol” (7 p.m., Fox).

• Ed has a Facebook revelation on the season finale of “$! My Dad Says” (7:30 p.m., CBS).

• Michael’s long-awaited spy movie debuts on “The Office” (8 p.m., NBC).

• The gruesome remains of a murdered wedding planner are discovered on Valentine’s Day on “Bones” (8 p.m., Fox).

• A failure to relax on “Royal Pains” (8 p.m., USA).

• Bear Grylls returns for season six of “Man vs. Wild” (8 p.m., Discovery).

• Hightower and Jane collaborate in the field on “The Mentalist” (9 p.m., CBS).

• Baby-related sleep deprivation saps Jack’s killer edge on “30 Rock” (9 p.m., NBC).

• A clear-cut accident mediation is anything but “Fairly Legal” (9 p.m., USA).

• “Out of the Wild” (9 p.m., Discovery) returns with a trip to Venezuela.

Cult choice

Val Kilmer and Vincent D’Onofrio star in the baffling 2002 cosmic mystery “The Salton Sea” (7:15 p.m., Cinemax).