The Unexpected Journey of Glenn Howerton: From 'ER' to 'It's Always Sunny in Philadelphia

"It's Always Sunny in Philadelphia" is often celebrated for its humble beginnings, with creators Glenn Howerton, Rob Mac, and Charlie Day starting the show with just $100 and a dream. Howerton's previous experience on "That '80s Show" and a brief stint on "ER" before the birth of "It's Always Sunny" showcased his versatility as an actor. While "ER" provided Howerton with a serious role, he later reflected on his unexpected journey into comedy. Despite his initial doubts, Howerton's performance on "ER" was well-received, leading to an extended storyline for his character. Although he didn't become a regular on the medical drama, Howerton's diverse acting experiences paved the way for his iconic role as Dennis Reynolds on "It's Always Sunny in Philadelphia."