On It’s Always Sunny in Philadelphia, Ronald “Mac” McDonald has been out and proud as a gay man since the iconic Season 12 episode “Hero or Hate Crime?” but Ava Coleman might still get a ...

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

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

How did Abbott Elementary and It’s Always Sunny in Philadelphia crossover ... Frank, Dee, Dennis, and Mac. Each of them gets ...

In the newest Abbott episode, "Volunteers," The Gang gets educated. The Abbott Elementary/It’s Always Sunny in Philadelphia Crossover Brought Out the Weirdest of Both ...

The star of the FX series also admits he was initially hesitant about the crossover concept as 'It's Always Sunny in ...

The cast of It’s Always Sunny in Philadelphia made its way to the ABC ... Rob McElhenney’s Mac, Danny DeVito’s Frank, Kaitlin Olson’s Dee and Glenn Howerton’s Dennis visiting Willard ...

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 ...

Claim a square if the gang speaks to the camera crew, pitches a horrible business idea or scars a student for life.

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 Abbott Elementary.

As of Jan. 9, the episode is available to stream on Hulu. The second crossover is expected to be an episode of "It's Always Sunny in Philadelphia," which has aired on FXX since 2013.