The crew is mostly happy to be there, until Dennis (Glenn Howerton) notices the cameras filming them. Ava (Janelle James) tries to dismiss it, saying, "We have like a Vanderpump thing going on ...

Watch Glenn Howerton and Jay Baruchel butt heads in trailer for tech comedy-drama BlackBerry Glenn Howerton goes bald in first look at drama about the rise and fall of BlackBerry ...

Brunson wasn’t the only person to warn unsuspecting Abbott Elementary fans about checking out It’s Always Sunny, which stars Rob McElhenney, Charlie Day, Kaitlin Olson, Glenn Howerton, and Danny ...

and Glenn Howerton’s Dennis scurrying away suspiciously after the gym’s scoreboard crashes to the floor. “It was kind of a joke at first, that the two shows should cross over,” he said.

The brief promo for the Jan. 8 crossover sees Charlie Day’s Charlie, Rob McElhenney’s Mac, Danny DeVito’s Frank, Kaitlin Olson’s Dee and Glenn Howerton’s Dennis visiting Willard R.

McElhenney’s Mac and his partners in business and crime Charlie (Charlie Day), Dee (Kaitlin Olson), Dennis (Glenn Howerton) and Frank (Danny DeVito) are living proof of what happens when you don ...

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

It might be always sunny in Philadelphia, but that doesn't mean there aren't some clouds about to hit Abbott Elementary school. But Dennis isn't having it. "No, I don't think so," he says. "I know ...