Choreographer Kenny Ortega is a guest judge — giving us a break from actors as judges — on “So You Think You Can Dance” (Fox at 8 p.m.), as the final 12 are narrowed down to the top 10.

A woman who weighs more than 400 pounds seeks help on “Extreme Weight Loss” (ABC at 8), and during the process, learns to snowboard.

Hanna and her mom are suspects in the killing of Detective Wilden, so no one is really sure why Mona decides to step up and take the fall to help them on “Pretty Little Liars” (ABC Family at 8); meanwhile, a surprise party for Emily goes awry thanks to unwanted guests.

SERIES PREMIERE: “The Chase” (GSN at 9) sounds pretty scary for a quiz show, as three contestants battle in a trivia competition and go up against an opponent called the Beast, who is described as all-knowing.

SERIES PREMIERE: Real estate shows are all the rage, as newcomer “Hot Listings Miami” (Style at 10) follows Katrina Campins , who owns a luxury real estate agency with a business partner who happens to be her ex-husband. In the opener, she runs into competition from a local broker surrounding an actor’s pricey home.

Things are about to get even tougher for the contestants in the arena on “Capture” (CW at 9), as one team ruins the entire food supply in a strategic move to sabotage everyone.

SERIES PREMIERE: Ever wonder what Shelby “Swamp Man” Stanga does when he’s not starring on History’s “Ax Men” as part of the logging crew? The answer is revealed in spinoff “The Legend of Shelby the Swamp Man” (History at 10), which follows him during his daily life, as he “lives and logs” in southern Louisiana.

On “Drunk History” (Comedy Central at 10), the host has a few drinks, and then proceeds to tell the tale of Patty Hearst’s kidnapping, along with how Mark Twain decided to be a writer.

President Obama makes his sixth visit to “The Tonight Show With Jay Leno” (NBC at 11:35).

“Jimmy Kimmel Live” (NBC at 11:35) hosts actress Julia Louis-Dreyfus, actor Nick Offerman and singer Michael Kiwanuka.

— Emily Yahr