'South Park' Returns Tonight: Watch a Preview Clip! (VIDEO)

You never really know what Trey Parker and Matt Stone, creators of "South Park," are going to throw at you. Case in point, the mid-season finale a few months back had many fans (including myself) wondering if this was going to be the final season.

But Parker and Stone have put those worries to rest, and "South Park" returns for the second half of its 15th season with all-new episodes tonight. But things might still change a bit, as the official synopsis for tonight's episode notes that Stan is struggling with his parents' marital problems and wants his life to return to normal.

Of course, it's never all serious on "South Park." Tonight also sees Cartman dealing with his own version of Asperger's Syndrome, which he refers to as "Ass-Burgers" Syndrome. Symptoms including finding hamburgers in his pants. We can only guess what Cartman is plotting with this one.

Check out a preview clip of tonight's episode, "Ass Burgers":