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

Note: The following story contains spoilers from "Abbott Elementary" Season 4, Episode 9. When "Abbott Elementary" creator ...

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.

Janine and Dee have a bonding moment in this sneak peek at the It's Always Sunny in Philadelphia/Abbott Elementary crossover event.

The two sitcoms could hardly be more tonally different, but this week’s crossover episode of “Abbott” was relatively seamless ...

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

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.

The anticipation for Abbott Elementary and It’s Always Sunny crossover episode has been building up among the fans of both ...

And when the volunteers arrive… hey, it’s Mac, Dennis, Charlie, Dee and Frank from It’s Always Sunny! Dennis spots the cameras filming their every move and instantly makes himself scarce, and when ...

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.