Since the fall TV season is beginning to heat up, here's a heads up on the new and returning shows and when they're premiering. TV Guide has a pretty comprehensive fall calender.

Everyday for the next couple weeks I'll be giving a preview of the night's best bets and a brief look at any new shows in the "What to Watch" posts. Tonight, you should definitely check out "It's Always Sunny in Philadelphia" at 10 on FX and stick around for "The League" at 10:30.