The August silly season is upon us. The CW debuts “Oh Sit!” (7 p.m.), a new series based on the game musical chairs, a pastime most of us outgrow around fourth grade.

Jamie Kennedy (“The Ghost Whisperer”) and Jessi Cruickshank (“MTV Live”) co-host. “Sit” invites a dozen adventure-seekers to play the old grade-school game at a furious pace, accompanied by live music.

What other schoolyard antics can we expect if this succeeds? Celebrity double dutch? Hopscotch with the stars? Competitive duck-duck-goose between the Kardashians and the stars of “Jersey Shore”? Perhaps Ralph Lauren could sponsor a reality version of Marco Polo!

• Speaking of arrested development, the Travel Channel debuts the new series “Toy Hunter” (9 p.m.).

There’s a Bible verse (1 Corinthians 13:11), cited in many wedding ceremonies, that observes, “When I became a man, I put away childish things.” Obviously, St. Paul was never a serious collector or a programmer for reality television. Or a guy who wore a baseball hat backward well into his 40s. But I digress.

”Hunter” shows Hembrough driving up and down the Garden State Parkway in search of childhood keepsakes he can buy and quickly flip. He and most of the collectors he meets are quasi-experts on their artifacts, which are mostly dolls and models licensed from popular entertainment franchises. A remarkable number of them were churned out in plastic factories in New Jersey during the 1950s and ’60s, the Golden Age of Creative Extrusion.

The show is either a nostalgic delight or a nerdy paradise, depending on your point of view. We encounter a Cher doll, a set of Colorforms vinyl playthings based on the cast of “Welcome Back, Kotter,” a rideable Aston Martin promotional toy emblazoned with a license plate that reads “007-Up!” and far too many “Star Wars” items.

Tonight’s other highlights

• Finalists perform on “So You Think You Can Dance” (7 p.m., Fox).

• India’s rat problem on “NOVA” (8 p.m., PBS).

• Undercover in the Hamptons on “Royal Pains” (8 p.m., USA).

• Dani treats a professional gamer on “Necessary Roughness” (9 p.m., USA).

• Women explain how they promised to have and hold their made man for better or for worse on “I Married a Mobster” (9 p.m., Investigation Discovery).