Abbott Elementary” star and creator, Quinta Brunson, and “It’s Always Sunny in Philadelphia” star and co-creator. Rob McElhenney, both shared news they’re collaborating on a crossover episode on social media.

Much like a kid entering the fourth grade, Abbott Elementary is growing in season 4 with many fresh faces — and Quinta Brunson tells Us she can't wait for fans to meet the show’s new characters. Among the newbies on the ABC sitcom will be family members of the teachers at Abbott.

The ABC series will crossover with FX’s It’s Always Sunny in Philadelphia for Season 4. Rob McElhenney, Danny Devito and Charlie Day will appear in the episode, as confirmed by a photo posted on social media Thursday.