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

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

How did Abbott Elementary and It’s Always Sunny in Philadelphia crossover ... Dee, Dennis, and Mac. Each of them gets paired up with members of the Abbott crew, but it doesn’t take long ...

The "Abbott Elementary" and "It's Always Sunny in Philadelphia" crossover episode ... I guess I assumed Mac and Dee were together because the actors Rob McElhenney and Kaitlin Olson are in ...

At first glance, a crossover episode between Abbott Elementary and It’s Always Sunny in Philadelphia makes all ... The arrival of Mac (Rob McElhenney), Dennis (Glenn Howerton), Charlie (Charlie ...

Okay, so let's kick things off with a "who's who" look at our major players tonight: FXX's "It's Always Sunny in Philadelphia": Rob McElhenney (Ronald "Mac" McDonald), Charlie Day (Charlie Kelly ...

McElhenney’s Mac and his partners in business and crime ... Also, as any longtime “Sunny” viewer knows, the show has provided many reasons why the Paddy’s Pub gang should not be allowed ...

It's Always Sunny in Philadelphia's Dennis, Dee, Charlie, Mac and Frank will all feature in the Abbott installment. If you want to catch what will surely be a chaotic episode of the ABC workplace ...