Charles Peckham Day is an American actor, writer, producer, and podcaster. He is best known for playing Charlie Kelly on the FX comedy It's Always Sunny in Philadelphia (2005–present), which he stars in with Rob McElhenney and Glenn Howerton, and of which he is also a writer and an executive producer. In 2011, he was nominated for a Critics' Choice Television Award and a Satellite Award for the role. He subsequently co-created the Fox sitcom The Cool Kids (2018–2019) with Paul Fruchbom and the Apple TV+ comedy Mythic Quest (2020–present) with Rob McElhenney and Megan Ganz, and continues to executive-produce the latter.

Glenn Franklin Howerton III is an American actor, writer, producer and podcaster. He is best known for playing Dennis Reynolds on the long-running sitcom It's Always Sunny in Philadelphia (2005–present) on FX/FXX, a series he developed with creator Rob McElhenney, and on which he serves as an executive producer and writer. From 2021 until 2023, he co-hosted The Always Sunny Podcast with his fellow co-creators McElhenney and Charlie Day.