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

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." ...

Charlie Kelly fit so naturally into the Abbott ... show through an entirely different prism when you see it on It’s Always Sunny in Philadelphia, and that version is much less family-friendly.

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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.

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.

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

And how can you watch Abbott’s It’s Always Sunny crossover episode live and online? We’ve got answers, along with a Charlie Day interview to get you even more pumped for “It’s Always ...

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.