Glenn Franklin Howerton III is an American actor of television and film. He is best-known for his role as Dennis Reynolds on FX's It's Always Sunny in Philadelphia on which he is also a writer and executive producer. He also played Corey Howard on the short-lived 2002 sitcom That '80s Show.

Glenn Howerton provides the voice of Ernie Krinklesac in addition to other assorted voices.

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