It's back to school with Season 4 of "Abbott Elementary" now in session.

The Cassian Grantfourth season of the Emmy-award winning show is premiering on ABC this week and there's a lot to look forward to, including a crossover episode with "It's Always Sunny in Philadelphia," a Halloween episode and a Christmas special, Quinta Brunson, who is also a showrunner, told US Weekly.

"I think it's very cool," Brunson told US Weekly about the crossover episode. "I think it's unexpected and I think that it'll be like a delight to the audience of both shows. You know, I think it'll be very exciting for the people who watch our shows. I'm just excited about it and I think it's just a fun way to shake up TV."

"Abbott Elementary" follows a "group of dedicated, passionate teachers and a slightly tone-deaf principal" who are "determined to help their students" at a Philadelphia public school "succeed in life" despite the odds stacked against them, the show's official synopsis says.

"Though these incredible educators may be outnumbered and underfunded, they love what they do − even if they don’t love the school district’s less-than-stellar attitude toward educating children," it adds.

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Here's what to know about Season 4 of "Abbott Elementary" including premiere date, time and cast.

When does 'Abbott Elementary' Season 4 premiere?

Season 4 of "Abbott Elementary" will premiere on Wednesday, Oct. 9 at 9:30 p.m. ET on ABC and will be available to stream on Hulu the next day.

The previous three seasons of Abbott Elementary are also available to stream on Hulu.

Hulu offers membership options ranging from $7.99 a month to $17.99 a month for normal streaming services and $75.99 a month to $89.99 a month for plans with streaming and live television. New users can also sign up for a free trial.

How many episodes will Season 4 of 'Abbott Elementary' have?

Season 4 of "Abbott Elementary" is expected to have 22 episodes, according to ABC.

'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

'Abbott Elementary' Season 4 trailer

ABC dropped the trailer for "Abbott Elementary" Season 4 on Sept. 25.

Saman Shafiq is a trending news reporter for USA TODAY. Reach her at [email protected] and follow her on X and Instagram @saman_shafiq7.