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

The star of the FX series also admits he was initially hesitant about the crossover concept as 'It's Always Sunny in Philadelphia ... our characters that could work on their show and still ...

Rudnesky: On "Always Sunny," is the cast's bar considered ... A perfect example of this is the episode "Charlie Work," where Charlie orchestrates a plan involving the purchase of thousands of ...

“We wanted [the ‘Always Sunny’ crew] to play like ... has done some adult literacy work in the past, the crossover sees Barbara take Charlie on as a student, asking him to read a book ...

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 ...

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

"It was a real privilege for me to get to be a part of it, to have them bring us in and make us a part of what they do, which they do so well," says the It's Always Sunny star and executive ...