It’s always busy for the It’s Always Sunny in Philadelphia cast.

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

The 'Abbott Elementary' EPs talk jokes cut from 'Always Sunny' crossover, including backstories for Frank and Mr. Johnson.

The Gang' cleaned up its act when it appeared on the ABC sitcom. But Rob McElhenney says the 'Abbott' teachers will curse and ...

It's Always Sunny in Philadelphia is about to release ... However, the best character pairing was Frank (Danny DeVito) and Mr. Johnson (William Stanford Davis). These two are a natural fit because ...

Once again, it all comes down to Frank’s love for Shadynasty. While it might not make most fan’s lists of best It’s Always Sunny in Philadelphia episodes, Season 7’s fifth episode “Frank ...

We always knew that It's Always Sunny in Philadelphia's Frank (Danny DeVito) would easily match Abbott Elementary's Mr. Johnson's (William Stanford Davis) weird. But we just didn't know how much.

Frank agrees to help the first-grade teacher ... When the cast of “Abbott Elementary” appears in an episode of “It’s Always Sunny in Philadelphia,” as is planned for the coming season.

Rob McElhenney teased that the Abbott Elementary/It's Always Sunny in Philadelphia Season 17 crossover may "surprise quite a few people." ...

Charlie learns to read, Dee impersonates Ben Franklin, and Frank fights raccoons. We don't quite know what's up with Dennis though.

And this year, the network is making comedy history when the It’s Always Sunny in Philadelphia gang ... cross paths with Frank (Danny DeVito), Charlie (Charlie Day), Dee (Kaitlin Olson), Mac ...

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