“Dancing with the Stars” (8 p.m., ABC): “Dancing with the Stars” pro

“Dancing with the Stars” (8 p.m., ABC): “Dancing with the Stars” pro Julianne Hough and country star Chuck Wicks speak the same language. “We both know what a ‘meet-and-greet’ is,” she said. “We both know what ‘meeting radio’ means. We’re both growing up at the same time.”

Hough and Wicks have been dating for months. Now the two will be partners on the new season of “Dancing with the Stars” which premieres tonight. Whether their relationship can stand the test of learning dances together is another matter.

This season’s “Dancing” will have other couples in the competition, too. Former professional bull rider Ty Murray will be hoofing it as will his wife, singer Jewel. The two, however, are partners with pros. So they will be competing against each other.

Newly engaged professional dancers Maksim Chmerkovskiy and Karina Smirnoff will go head-to-head, too.

Hough has dated those inside and outside show business. She said she likes dating someone who is in show business because she can relate to them better. “It’s cool to be able to share these things together and be excited for each other,” she said.

“How I Met Your Mother” (8:30 p.m., CBS): On “How I Met Your Mother,” Ted reunites with his college flame (Laura Prepon, “That ’70s Show”), prompting Lily and Marshall to finally reveal how much they always loathed the woman.

“Battles B.C.” (9 p.m., History): A warrior named Hannibal of Carthage had a mission (destroy Rome or die trying), as we are reminded on a new History series called “Battles B.C.” And Hannibal tried hard. He was the military strategist who in 219 B.C. deployed 40 elephants and a massive army, crossing the Alps and catching the Romans by surprise. Hannibal’s war stories consume the premiere of “Battles B.C.,” whose eight episodes will also target other ancient military leaders such as David, Caesar and Alexander. Not only is this series informative (military experts weigh in with a fusillade of facts), but also lively, borrowing its style from the computer-graphics giddiness of the feature film “300.”

“CSI: Miami” (10 p.m., CBS): Horatio tries to save his son from the investigator’s crazed ex (Elizabeth Berkley).

“Castle” (10 p.m., ABC): Richard Castle is a wildly popular mystery novelist. He’s also a best-seller with the ladies.

But when he joins in the pursuit of a real-life copycat killer staging murder scenes as depicted in his novels, Castle fails to impress Kate Beckett, the attractive NYPD detective who is handling the case.

“I work for a living,” she tells Castle pointedly. “So that makes you one of two things in my world: the guy who makes my life easier, or the guy who makes my life harder. Trust me, you don’t want to be the guy who makes my life harder.”

Of course, what’s gonna happen is, Castle will be making her life more interesting — and vice versa. Just watch them rub each other the wrong way ... and the sparks fly. Somehow crimes are also solved in the process.

ABC’s new murder-mystery-romance “Castle” seems to be a re-imagined version of “Moonlighting” with a dash of “Murder, She Wrote.” Time will tell if it’s a best-seller.

It stars Nathan Fillion in the title role and Stana Katic as Detective Beckett, with Susan Sullivan as Castle’s outrageously theatrical mother and Molly Quinn as his sharp teenage daughter.