TV Preview

It's Always Sunny in Philadelphia

10-10:30 PM · FX · Returns Sept. 18

FX's foulmouthed comedy delves even deeper into the toilet for its fourth season. Literally. ''Frank [Danny DeVito] and Charlie [Charlie Day] find a turd in their bed,'' explains star/exec producer Rob McElhenney, ''and Dennis [Glenn Howerton] and I go into full CSI mode to figure out who did it.'' Also on tap: Sinbad and pop star Rob Thomas guest on a rehab-themed show, and the series travels back in time to reveal how the crew cracked Philly's Liberty Bell. Still, says director Fred Savage, ''the best moments are when it's just the gang in the bar.''

Sign up for EW.com's What to Watch Newsletter!

What to watch on TV. Hear what's on tap for the night ahead and get witty, morning after recaps of top shows (sent weekday mornings).
Originally posted Sep 05, 2008 Published in issue #1010-1011 Sep 12, 2008 Order article reprints