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 ...

Lisa Kudrow revealed during an interview on “The Drew Barrymore Show” (via People) that she recently discovered a note the ...

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

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.

After much anticipation, the unlikely meeting of the two worlds unfolded on Wednesday's installment of "Abbott Elementary." ...

The two sitcoms could hardly be more tonally different, but this week’s crossover episode of “Abbott” was relatively seamless ...

Philly pride runs strong, even for celebrities. The Welcome to Wrexham creator and Bradley Cooper are not the only famous ...

Here's a look at our real-time thoughts on tonight's crossover between FXX's It's Always Sunny in Philadelphia and ABC's ...