Danny DeVito's Frank Reynolds became a major part of It's Always Sunny In Philadelphia from season 2 onwards, but here's who was originally in line for the part. It's Always Sunny In Philadelphia has been running since 2005, and is a pitch-black sitcom following the lives of the Paddy's Pub gang.
Season 1 introduced Dennis, his twin sister Dee and their friends Mac and Charlie, who were all in their own ways horrible, selfish and amoral losers. While the show quickly found a following, it was
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