On the night of a meteor shower, Liane goes to Mr. Mackey's party, leaving Cartman to be babysat by Stan's 12-year-old sister, Shelley, who is an aggressive bully.
After an unsuccessful attempt with an overweight tom, she winds up seducing a large group of cats, and invites them back to Cartman's house and cracks open catnip.
Cartman manages to entice Skyler out of his house with a taping of his Salma Hayek impersonation while Shelley sneaks in and destroys his prized guitar.
They return home to find Kitty and many other cats engaged in a massive feline orgy.
Coincidentally, this film was released on the same day as South Park: Bigger, Longer & Uncut, two weeks before the original broadcast of this episode.
The makers of South Park were disappointed that it performed better at the box office than their film despite being critically panned; and some underage moviegoers snuck into the R-rated South Park film after having bought tickets to the PG-13-rated Wild Wild West.