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Glenn Franklin Howerton III (born April 13, 1976) 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. Since November 2021, he has co-hosted The Always Sunny Podcast, with his fellow co-creators McElhenney and Day.
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Sirens
2025 · as Ethan Corbin II
BlackBerry
2023 · as Jim
Velma
2023 · as Fred (voice)
How It Ends
2021 · as John
Archenemy
2020 · as The Manager
The Hunt
2020 · as Richard
A.P. Bio
2018 · as Jack Griffin
The Strangers
2008 · as Mike
Crank
2006 · as Hospital Doctor
It's Always Sunny in Philadelphia
2005 · as Dennis Reynolds
Must Love Dogs
2005 · as Michael