And so far, fans are pleased. A.P. Bio stars Glenn Howerton as Jack Griffin, a disgraced former Harvard professor who finds his job usurped by his literary and professional nemesis, Miles Leonard.

I want to know what he got up to outside the view of the school’s cameras ... So, when we get the R-rated side of this hilarious crossover, I bet it will focus mostly on Dennis.

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 ...

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 ...