Frank has a fair claim to being It's Always Sunny in Philadelphia's best character, and these episodes prove it.

Glenn Howerton addresses the ongoing 'It's Always Sunny in Philadelphia' fan theory about Dennis Reynolds being a serial killer ...

G lenn Howerton is best known for starring as Dennis Reynolds in It's Always Sunny in Philadelphia, a role that he has held since 2005. It's Always Sunny season 17 is set to debut on July 9, and ...

Oh, Dennis Reynolds, the resident sociopath of It’s Always Sunny in Philadelphia.Thanks to Glenn Howerton’s mastery of comedic timing, there’s an argument that Dennis is the show’s ...