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.