Producers Justin Halpern and Patrick Schumacker break down the epic 'Abbott Elementary' and 'It's Always Sunny in Philadelphia' crossover episode

The 'Abbott Elementary' EPs talk jokes cut from 'Always Sunny' crossover, including backstories for Frank and Mr. Johnson.

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

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

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Philly pride runs strong, even for celebrities. The Welcome to Wrexham creator and Bradley Cooper are not the only famous guest stars to pay tribute to their roots in an episode of Abbott. Eagles football players Jalen Hurts and Jason Kelce also made cameos in Season 3, as Abbott ’s always one to cater to their PA fanbase.

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

Part 1 of the "Abbott Elementary" and "It's Always Sunny in Philadelphia" crossover coincided with the midseason premiere of "Abbott Elementary." The shows air on different networks but share the setting of Philadelphia. The episode aired live on ABC on Jan. 8.

It might be always sunny in Philadelphia, but that doesn't mean there aren't some clouds about to hit Abbott Elementary school. A major crossover event kicks off on Wednesday's episode of Abbott Elementary,

Abbott Elementary creator and star Quinta Brunson has issued an important advisory to fans about season four’s midseason premiere, which featured a special crossover with another hit ABC sitcom, It’s Always Sunny in Philadelphia.