The Abbott Elementary & It's Always Sunny In Philadelphia crossover had some ridiculous rivalries, but Charlie got a surprisingly uplifting subplot.

The star of the FX series also admits he was initially hesitant about the crossover concept as 'It's Always Sunny in Philadelphia' heads into its 17th season.

Note: The following story contains spoilers from "Abbott Elementary" Season 4, Episode 9. When "Abbott Elementary" creator Quinta Brunson mentioned the idea of a crossover episode with "It's Always ...

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

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Back in early November, Ralph shared that her kindergarten teacher, Barbara, would be spending some quality time with Day's Charlie. "But you want to know what? I had no idea those were criminals.

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.

It’s the first part in the crossover with It’s Always Sunny in Philadelphia and features the cast of the latter inside the hallways at Abbott. Charlie Day appears in a good amount of the ...

The cast of "It's Always Sunny in Philadelphia" will appear on "Abbott Elementary" tonight. Here's how to watch, when it airs and what to know about the crossover.

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

With the first part of 'Abbott Elementary' and 'It's Always Sunny in Philadelphia's crossover airing Wednesday on ABC, ...

The anticipation for Abbott Elementary and It’s Always Sunny crossover episode has been building up among the fans of both shows for months, and Part 1 of it is finally here. Aired as Season 4 Episode ...