Big Brother (9pm, CBS) - In the 13th season opener, eight new house guests are introduced, plus some notorious pairs from previous seasons who will also play the game.

Rookie Blue (10pm, ABC) - A full moon brings the crazies out as Andy and Swarek track a disturbed man while looking into the theft of three severed heads from a medical lab. Andy tries to protect a young woman who may be the next victim, and ends up putting herself and Luke in harm's way.

Suits (10pm, USA) - Harvey goes rogue in order to fix a crisis with a client despite Jessica's desire to reign him in. Elsewhere, Mike turns to Rachel for guidance when he learns he'll be hosting a dinner for rookies, and important tradition at the firm.

Extreme Chef (10pm, Food) - A mountain challenge has three chefs, including Rocky Mount's Chef Jerome Brown, hiking up a steep hill with all their cooking supplies and diving into a frigid lake to catch fish.

Wilfred (10pm, FX) - Ryan gets his wallet back from his violent, porn-addicted neighbor (Ethan Suplee), who wants revenge on the thief, but who also wants a pal.

Louie (10:30pm, FX) - Louie searches for a new home in New York. Donna Hanover, ex-wife of former New York City mayor Rudy Giuliani, plays Louie's real estate agent.

Ugly Americans (10:30pm, Comedy Central) - Callie reluctantly becomes her baby sister's guardian when their estranged parents' reunion proves to be a short one.

So You Think You Can Dance (8pm, Fox) - Two of the 16 remaining dancers are eliminated, after a performance by the AXIS Dance Company. Kristin Chenoweth is a guest judge.

Expedition Impossible (9pm, ABC) - The challenges tonight include riding wild stallions and kayaking a raging river.

Extreme Chef (10pm, Food) - This new show hosted by Marsh Mokhtari challenges chefs to create delicious dishes under extreme circumstances. The ida is to push competitors to their mental and physical limits. Tonight, chefs must cook with unmarked canned goods when they're dropped off in a neighborhood in Newhall, California. Later, they must knock on residents' doors to gather cooking materials, and prepare hot appetizers on the block of a car engine. Heads-up: A local chef will compete in next week's episode, in which chefs must swim across a lake to gather ingredients. We'll have more on that soon!

Suits (10pm, USA) - Love this new show. Tonight, Mike has an ethical dilemma wwhen Louis forces him to make a decision that could hurt his relationship with Harvey. Elsewhere, Harvey's past comes back to haunt him during a case.

Rookie Blue (10pm, ABC) - Andy and Gail go undercover as cocktail waitresses ina club known for drug trafficking. Also, a young woman files a complaint against Dov, and Tracey finds she still has feelings for Det. Barber.

Wilfred (10pm, FX) - Ryan deceives Wilfred to get him to the doggie dentist, and there are repercussions when Wilfred tells Ryan something disturbing about his owner, Jenna.

Louie (10:30pm, FX) -- Louie has an unsettling encounter on the way to a first "non-date," and later receives an intriguing proposition while dropping off Jane at school.