It's Always Sunny in Philadelphia season 13

The thirteenth season of the American comedy television series It's Always Sunny in Philadelphia premiered on FXX on September 5, 2018. The season consists of 10 episodes and concluded on November 7, 2018.

Main cast

 * Charlie Day as Charlie Kelly
 * Glenn Howerton as Dennis Reynolds
 * Rob McElhenney as Mac
 * Kaitlin Olson as Deandra "Dee" Reynolds
 * Danny DeVito as Frank Reynolds

Recurring cast

 * Mary Elizabeth Ellis as The Waitress
 * David Hornsby as Cricket

Guest stars
• Mindy Kaling as Cindy

• Artemis Pebdani as Artemis Dubois

• Lance Barber as Bill Ponderosa

• Travis Schuldt as Ben The Soldier

• Sandy Martin as Mrs. Mac

• Lynne Marie Stewart as Bonnie Kelly

• Gregory Scott Cummins as Luther Mac

• Michael Naughton as The Waiter

• Andrew Friedman as Jack Kelly

• Mary Lynn Rajskub as Gail the Snail

• Humphrey Ker as Alan

• Tyler Labine as Shawn Dumont

• Tricia O'Kelley as Brenda

• Gillian Vigman as Karen

• Beau Allen as himself

• Jason Kelce as himself

Production
On April 1, 2016, the series was renewed for a thirteenth and fourteenth season, which tied it with The Adventures of Ozzie and Harriet as the longest-running (in number of seasons) live-action sitcom in American TV history.

In March 2017, following the twelfth season finale in which Glenn Howerton's character was seemingly written off the show, Howerton expressed doubt about his return for the thirteenth season, describing it as "partially a creative and personal decision." He also suggested that the show would take an "extended hiatus" in order to accommodate the cast's other projects. In late April, Kaitlin Olson confirmed Sunny's extended hiatus ahead of the thirteenth season due to the cast's busy schedules. In August 2018, Rob McElhenney confirmed that Howerton is "in pretty much every episode" of the season. Howerton appeared in six of the season's ten episodes, but had no writing credits.

Reception
The thirteenth season received positive reviews. On Rotten Tomatoes, it has an approval rating of 94% with an average score of 8/10 based on 18 reviews. The site's critical consensus reads, "It's Always Sunny's winning formula keeps the laughs rolling and the stomachs turning in a thirteenth season that's topical, triumphant, and toxic in the best way." The finale in particular received praise, with many critics lauding the unexpected emotional and artistic depth of Rob McElhenney's performance.