When It's Always Sunny in Philadelphia debuted in 2005, it set a new standard as a low/no-budget single-camera sitcom with no laughtrack, created by relative unknowns who slowly grew it into a record-breaking 15 seasons and counting. Creator Rob McElhenney plays Mac, who runs a bar with sociopathic frienemies Charlie Kelly , Dennis Reynolds , and Dennis' sister, Dee .
Their debauched antics are further heightened with the addition of Danny Devito in season 2 as Dennis and Dee's father Frank Reynolds, forming the central five who have carried the show from its early days to its ongoing run, leaving it as the longest running live-action American sitcom.
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