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 explains how Mythic Quest co-creator Charlie Day's appearance in season 4 came about and why it was finally the right time.

At first glance, a crossover episode between Abbott Elementary and It’s Always Sunny in Philadelphia ... Dennis (Glenn Howerton), Charlie (Charlie Day), Dee (Kaitlin Olson), and Frank (Danny ...

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 ...

The "Abbott Elementary" and "It's Always Sunny in Philadelphia" crossover ... Rudnesky: This was one of my biggest questions: Can Charlie (Charlie Day) read? Compendio: Infamously, Charlie ...

Okay, so let's kick things off with a "who's who" look at our major players tonight: FXX's "It's Always Sunny in Philadelphia": Rob McElhenney (Ronald "Mac" McDonald), Charlie Day (Charlie Kelly ...

Since 2005, the FX (and FXX) sitcom “It’s Always Sunny in Philadelphia” has ... Mac (McElhenney), the dim, boyish hunk; Charlie (Charlie Day), the illiterate, easily confused handyman ...

The hit ABC sitcom is joining forces with the cast of FX's "It's Always Sunny in Philadelphia ... But the groups don't completely disagree. Charlie (Charlie Day) spends time with Jacob (Chris ...