Here's some background and inside jokes to help fill in some of the gaps for viewers who don't watch both Philly-based shows.

Willard R. Abbott Elementary School and its students, teachers and administrators are now officially part of the It’s Always ...

If it seems like Howerton's Dennis isn't as in the mix with The Gang in this episode, there's a reason – one that will play out during the "Always Sunny" Season 17 episode. "Dennis is the key ...

This matchup brought together two Philly casts: “Abbott Elementary” and “It’s Always Sunny in Philadelphia.” The crossover ...

Fan reactions to the 'Abbott Elementary' and 'It's Always Sunny in Philadelphia' crossover show that it was the strange combo ...

Still on its ever?descending moral downward spiral, "The Gang," as they're known, from "It's Always Sunny in Philadelphia" is back for an eighth season on its FX hit series. The owners of the run?down ...

Two comedy forces collided this week on Abbott Elementary, as the school staff welcomed the Paddy’s Pub gang from FXX’s It’s ...

The Gang from It's Always Sunny in Philadelphia looks to leave their mark on Abbott Elementary in a new crossover teaser that was released.

Episode 8 The Gang Tends Bar It’s Always Sunny in Philadelphia Recap: Just Another Day at the Bar “The Gang Tends Bar” pretends this is a show about normal people. Episode 7 PTSDee It’s ...

“The Gang” is all here — and bringing absolute chaos to Abbott Elementary. The cast of It’s Always Sunny in Philadelphia made its way to the ABC show, which is set in Philly, for the ...

The cast of It’s Always Sunny in Philadelphia invades Abbott Elementary in the first teaser trailer for the comedy crossover event. It’s pretty uncommon to see shows on one network crossover ...

Decider has an exclusive promo image and a two-minute teaser trailer that offers compelling insight into what’s in store for the It’s Always Sunny gang and Abbott’s staff. Decider’s ...