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

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

Back in early November, Ralph shared that her kindergarten teacher, Barbara, would be spending some quality time with Day's Charlie. "But you want to know what? I had no idea those were criminals.

The cast of It’s Always Sunny in Philadelphia made its way to ... The brief promo for the Jan. 8 crossover sees Charlie Day’s Charlie, Rob McElhenney’s Mac, Danny DeVito’s Frank, Kaitlin ...

It’s Always Sunny is not for the faint of heart, and the showrunners don’t plan on compromising its shock-value style ... or Melissa will finally teach Charlie how to read.

The "It's Always Sunny in Philadelphia" crew is headed to "Abbott Elementary" in the first of two crossover episodes.