Patton Oswalt and Glenn Howerton Explain the Enigmatic Draw of It's Always Sunny Characters

Glenn Howerton and Patton Oswalt are teaming up for NBC's new comedy A.P. Bio but the two have another connection -- their love of It's Always Sunny in Philadelphia characters.

Howerton is mandated to defend the ridiculous behavior of the It's Always Sunny crew -- he's an executive producer and star

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• A.P. Bio
• Patton Oswalt
• Glenn Howerton
• It's Always Sunny in Philadelphia

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