Hearing the chaos at Abbott Elementary? That’s not just the kids—it’s “the gang” from “It’s Always Sunny in Philadelphia” making a guest appearance as volunteers in a much-anticipated crossover.

In Episode 9 of Season 4 of “Abbott Elementary,” Ava shares that the school district is sending volunteers to assist, but things quickly go awry upon their arrival, according to ABC.

Janelle James, who portrays Principal Ava, expressed to YSL News how “cool and surreal” it was to have the “It’s Always Sunny” cast on their set and to actually film in Paddy’s Pub from their show.

“I’ve been a fan since it first premiered,” James reminisces about “Sunny,” which debuted in 2005. “Back in high school, I was defending it, saying ‘No, it’s hilarious! It’s supposed to be satire,'” she chuckles.

The fourth season of the Emmy-winning series, which debuted on October 9, has resonated well with audiences, seeing an impressive 321% increase in live and same-day viewership, climbing from 2.13 million to 8.96 million, as noted by ABC.

Here’s what you need to know about the “Abbott Elementary” crossover with “It’s Always Sunny in Philadelphia” for Season 4, including premiere dates and cast details.

When does the ‘Abbott Elementary’ crossover episode with ‘It’s Always Sunny in Philadelphia’ air?

The crossover episode will be broadcast on Wednesday, January 8 at 8:30 p.m. ET/PT on ABC, with streaming available on Hulu the following day.

ABC will re-air the episode on Friday, January 10 at 8:30 p.m. EST.

Fans can also catch previous seasons of “Abbott Elementary” on Hulu.

Hulu’s subscription plans vary from $7.99 to $17.99 a month for standard streaming, and from $75.99 to $89.99 a month for packages that include live TV. New users can take advantage of a free trial.

‘Abbott Elementary’ Season 4 cast

The cast for Season 4 of “Abbott Elementary” includes:

• Quinta Brunson as Janine Teagues
• Tyler James Williams as Gregory Eddie
• Janelle James as Ava Coleman
• Chris Perfetti as Jacob Hill
• Lisa Ann Walter as Melissa Schemmenti
• William Stanford Davis as Mr. Johnson
• Sheryl Lee Ralph as Barbara Howard

An ABC representative previously mentioned that all regular cast members from “It’s Always Sunny in Philadelphia” will appear in the episode. Behind-the-scenes images shared by the cast on social media confirm that Danny DeVito, Glenn Howerton, Charlie Day, Kaitlin Olson, and Rob McElhenney will be featured.

Exciting TV collaboration

Quinta Brunson, the showrunner, shared her enthusiasm for the crossover episode during an appearance on “Live with Kelly and Mark” just ahead of the season’s premiere, expressing how “excited” she is for it. Another crossover is also on the horizon for Season 17 of “It’s Always Sunny in Philadelphia.”

<p”These two shows are set in Philadelphia; our series takes place in West Philadelphia, and theirs is set in South Philadelphia. It’s wonderful to merge them, showcasing the diversity of our city and the interactions that take place,” Brunson stated.

In a separate conversation with US Weekly, Brunson described the partnership as “a fun way to shake up TV.”

“I believe it will be a surprise, and I think fans of both shows will really enjoy it,” Brunson shared with US Weekly.

The sitcom “Abbott Elementary” centers around a “team of committed and enthusiastic educators and a somewhat oblivious principal” who are “dedicated to ensuring their students in a Philadelphia public school succeed against the odds,” as stated in the official summary.

Conversely, “It’s Always Sunny in Philadelphia,” which first aired in 2005, tells the story of “five misfits” – Mac, Dennis, Charlie, Sweet Dee, and Frank – who manage and run Paddy’s Pub in Philadelphia, according to the show’s description.

“Their ongoing schemes often lead to troublesome situations, but they never learn from their errors,” it continues.

How many episodes will be in Season 4 of ‘Abbott Elementary’?

“Abbott Elementary” Season 4 is anticipated to consist of 22 episodes, as reported by ABC.