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 ...

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 ...

By Christy Piña Associate Editor “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 ...

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.

The call was made back in 2013 to move It's Always Sunny in Philadelphia to FXX. Here's why The Gang should be honored with a return to FX.