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.

The idea for the crossover was conceived by It’s Always Sunny creator and star Rob McElhenney and Abbott creator and star Quinta Brunson, who was asked to name the greatest rapper of all time for ...

Spoilers for the Abbott Elementary and It’s Always Sunny in Philadelphia crossover are ahead! If you haven’t watched the ...

The gang from "It's Always Sunny in Philadelphia" isn't known for being charitable. The selfish, hilariously unhinged dive bar group probably shouldn't be anywhere near a school building, ...

Court-ordered community service, urine-soaked animal pelts, and a Billy Madison homage: How It’s Always Sunny infiltrated ...

It List, our weekly rundown of what’s new and notable. In it, I recommended a slew of upcoming releases to watch, stream, ...

Part 1 of the "Abbott Elementary" and "It's Always Sunny in Philadelphia" crossover coincided with the midseason premiere of ...

Justin Baldoni’s lawyer Bryan Freedman appeared on an episode of “The Megyn Kelly Show” where the former Fox News host played ...

The crossover episode of two is the ultimate tribute to the city’s attitude, quirks, and, of course, its signature phrase: ...

Abbott Elementary” and “It’s Always Sunny in Philadelphia" don’t have much common ground. That’s why their collaboration felt fresh.

In the clip, from Abbott Elementary’s season four episode Volunteers, the staff at the elementary school meet the misfits from It’s Always Sunny In Philadelphia, who have arrived under the guise of ...