The Abbott Elementary & It's Always Sunny In Philadelphia crossover had hilarious character interactions, but it hid callbacks in its witty writing.

The cast of It’s Always Sunny in Philadelphia made its way to the ABC show, which is set in Philly, for the crossover episode of comedy writers’ dreams. The brief promo for the Jan. 8 ...

There was a moment during the filming of the “Abbott Elementary” and “It’s Always Sunny in Philadelphia” crossover episode that blew Quinta Brunson’s mind. It was the first scene where ...

The "It's Always Sunny in Philadelphia" crew is headed to "Abbott Elementary" in the first of two crossover episodes.

There's something about FXX's Rob McElhenney, Charlie Day, Glenn Howerton, Kaitlin Olson, and Danny DeVito-starring It's Always Sunny in Philadelphia that's bothered me over the past few years.

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 ...

The highly anticipated crossover episode of “Abbott Elementary” and “It’s Always Sunny in Philadelphia” blends the raunchy, NSFW style of the FX show with the witty, family-friendly romp.