'It's Always Sunny in Philadelphia' (FX)

Philadelphia (Philadelphia, Pennsylvania)Danny DeVito
Premieres: Thursday, Sept. 15 at 10 p.m. Expect to see: Season 7 of "It's Always Sunny" kicks off with an episode titled "Frank's Pretty Woman," which features Danny DeVito's Frank proposing to a prostitute. And the entire season will feature Fat Mac, as actor Rob McElhenney has gained a... FX