It’s Always Sunny in Philadelphia (FXX at 10) Frank (Danny DeVito, far right) tries to get Mac to help with the Gay Pride Parade float on the season finale. Pictured: (l-r) Charlie Day, Kaitlin Olson and David Hornsby. (Patrick McElhenney/FXX)

(All times Eastern.)

Chicago Med (NBC at 8) The emergency department faces a lockdown after deadly chemicals spill, putting lives at risk.

Empire (Fox at 8) Cookie and Lucious compete over who can sign an artist first.

Modern Family (ABC at 9) Cam tries to reconnect with his country roots by getting a pet chicken.

Mysteries at the Museum (Travel at 10) Host Don Wildman examines a diorama of the last execution of the Salem witch trials.

Premieres

The Wild Andes: Patagonia Untamed (Smithsonian at 8) Explore the longest mountain chain on the planet.

Clique (Pop at 10) Drama from British producers of “Skins” about a group of girls who intern together at their economic professor’s corporation.

Returning

Texas Metal (Velocity at 9) Season 2.

Log Cabin Fever (GAC at 9) Season 2.

The Real Housewives of New Jersey (Bravo at 9) Season 9.

Storage Wars (A&E at 10) Season 12.

Late Night

Daily Show/Noah (Comedy Central at 11) Rebecca Traister.

Tonight Show/Fallon (NBC at 11:34) Eddie Redmayne, Jack Whitehall, Chuck Todd, Lauren Daigle.

Late Show/Colbert (CBS at 11:35) Chris Pine, Major Garrett, Triumph the Insult Comic Dog.

Jimmy Kimmel Live (ABC at 11:35) Melissa McCarthy, Dennis Miller, the Milk Carton Kids.

Late Late Show/Corden (CBS at 12:37) Noah Centineo, Derren Brown, Morrissey.

Late Night/Meyers (NBC at 12:37) Sarah Jessica Parker, Hallie Jackson, Franklin Vanderbilt.

Sarah Polus