rachelSeems fitting to sneak in a new summer series set in the seasonal world of sleepaway camps. Even a bad one.

Rachel Griffiths stars as the head of “Camp” (NBC, 10 p.m.), where counselors drink and smoke pot, taunt the rich kids across the lake and obsesses about sex. It’s “Meatballs” without mirth, with a bunch of cardboard characters and shot, shockingly, in New South Wales, Australia (they couldn’t find a cheap American wilderness to depict their camp?).

“Inside: Secret America” (National Geographic Channel, 10 p.m.) purports to be a scathing investigative series, but there’s nothing exactly secret about America’s love for absurdly big, unliscenced guns. Mariana van Zeller goes into gun stores trying to buy automatic weapons. She peeks inside a gun show like it’s forbidden world instead of one, say, open to the public. But in the name of balance, she also learns to shoot. Future subjects include sex slavery and drugs; heaven knows how she’ll participate in that one.

The new “R&B Divas L.A.” (TV One, 10 p.m.), a spinoff of the original “R&B Divas” set in Atlanta, features Chante Moore, Kelly Price, Dawn Robinson, Lil’ Mo, Claudette Ortiz and Michel’le.

Also new tonight is the grown up variations of “Toddlers & Tiaras,” “Crown Chasers” (TLC, 10 p.m.).

The method to recycle the brief “stars” of “The Real World,” who go by in such a blur now that none of them stick, is the blunt and unimaginative “The Challenge” (MTV, 10 p.m.) which returns for a new season tonight in Thailand, where teams are made up of people who hate each other from previous seasons. Among those still involved is Trishelle, who must be pushing 40 by now.

“The American Baking Competition” (CBS, 9 p.m.) reaches its first season finale by choosing a $25,000 winner.

Danny Pudi of “Community” plays a shock jock on “Royal Pains” (USA, 9 p.m.).

Elyssa and Helen are up for evicition, but a third nominee has to be made by the secret MVP before the veto competition on “Big Brother” (CBS, 9 p.m.).

Eva Longoria hosts the remaining cooks on “MasterChef” (Fox, 8 p.m.).

Final auditions are held on “America’s Got Talent” (NBC, 9 p.m.), after an hour’s summary of Tuesday’s show.

Robert Osborne picks the movies tonight on Turner Classic Films and three of them have to do with the letter X: “Comrade X” (1 a.m.), “Madame X” (2:45 a.m.) and “X the Unknown” (4:15 a.m.). Also: “The Reckless Moment” (8 p.m.), “Trade Winds” (9:30 p.m.) and “Algiers” (11:15 p.m.).

In baseball, Oakland at Pittsburgh (ESPN, 7 p.m.) gets a national audience.

Daytime Talk

Kelly & Michael: Adam Sandler, Clara, Beth Stern. The View: Pattie Mallette, Debbie Matenopoulos. The Talk: Smokey Robinson, Arianna Huffington, Nadia G, Human Nature, Regis Philbin. Ellen DeGeneres: Russell Brand, Wolfgang Puck (rerun). Wendy Williams: Mally Roncal.

Late Talk

David Letterman: Salma Hayek, Tony Hale, Houndmouth. Jay Leno: John Malkovich, Olivia Munn, Blackberry Smoke. Jimmy Kimmel: Kevin Nealon, Michael B. Jordan, Karmin. Jimmy Fallon: Adam Sandler, Mireille Enos, Eleanor Friedberger. Craig Ferguson: Cedric the Entertainer, Jess Weixler. Carson Daly: Zach Braff, Neil Gaiman, Metz (rerun). Tavis Smiley: Tom Reiss, the Whispers. Conan O’Brien: Kevin Bacon, Charlie Hunnam, Bernhoft. Chelsea Handler: Channing Tatum, Sarah Colonna, Julian McCullough, Gary Valentine (rerun).