While the actor and writer has since settled into a groove with the long-running series, there was a point where he was worried the show might have "peaked."

I had not figured out yet how to stretch myself and be able to do other things that I wanted to do with my career outside of the show,” Howerton explainedNEED TO KNOWGlenn Howerton revealed during PaleyLive's panel for the 20th anniversary of It's Always Sunny in Philadelphia that he almost quit the show in 2018He said that being an actor,

For a legendary television show that was initially thought to be a short film shot on a digital camcorder by Rob McElhenney, It's Always Sunny in Philadelphia has come a long way, reaching truly unimaginable heights.