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.

The highly anticipated crossover episode of “Abbott Elementary” and “It’s Always Sunny in Philadelphia” blends the raunchy, NSFW style of the FX show with the witty, family-friendly romp.

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

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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.

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

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.

"Abbott Elementary" star Janelle James is schooling us on that "It's Always Sunny" crossover and unwinding with the help of "rich people" wellness.

A new “Abbott Elementary” episode brings volunteers from “It’s Always Sunny in Philadelphia.” The crossover episode airs Wednesday, Jan. 8, at 8:30 p.m. ET on ABC.

Justin Baldoni’s lawyer Bryan Freedman appeared on an episode of “The Megyn Kelly Show” where the former Fox News host played an alleged voice message Baldoni sent to his team in which he claims he was “sent to the basement” during the “It Ends With Us” premiere because Lively allegedly did not want him anywhere …