After more than two decades of playing Charlie Kelly ... so that if an Always Sunny fan watches their show, it feels authentic to the characters they know,” he explained.

The star of the FX series also admits he was initially hesitant about the crossover concept as 'It's Always Sunny in Philadelphia ... to come up with something funny to do. Charlie Kelly fit ...

The It's Always Sunny in Philadelphia half of the Abbott Elementary crossover is set to premiere in June, Rob McElhenney ...

It’s always busy for the It’s Always Sunny in Philadelphia cast.

When “Abbott Elementary” creator Quinta Brunson mentioned the idea of a crossover episode with “It’s Always Sunny in Philadelphia” — fueled from a conversation with Rob McElhenney ...

Rob McElhenney teased that the Abbott Elementary/It's Always Sunny in Philadelphia Season 17 crossover may "surprise quite a few people." ...

McElhenney’s Mac and his partners in business and crime Charlie (Charlie ... Even if we didn’t know this, the “Abbott" + "Sunny” team-up would still feel something special at a time ...

The episode, which debuted on January 8, was a crossover with "It's Always Sunny in... Charlie Day, Kaitlin Olson, Danny DeVito, Sheryl Lee Ralph, and Lisa Ann Walter are pictured in "Abbott ...