Mr. Garrison causes problems for the children of South Park. "Splatty Tomato" is the tenth episode of the show's 21st season.

PC Principal heads to the doctor when he has a problem on South Park. "Super Hard PCness" is the ninth episode of the show's 21st season.

A science project catches the attention of some very important people on South Park. "Moss Piglets"is the eighth episode of the show's 21st season.

Cartman is heartbroken when things get rocky between he and Heidi on South Park. "Doubling Down" is the seventh episode of the show's 21st season.

There are problems with witches on Halloween on South Park. "Sons a Witches" is the sixth episode of the show's 21st season.

There's a rallying cry to find the person responsible for the opiate crisis on South Park. "Hummels & Heroin" is the fifth episode of the show's 21st season.

The boys try to put a stop to fake news on South Park. "Franchise Prequel" is the fourth episode of the show's 21st season.

People wonder if they are a victim of their DNA on South Park. "Holiday Special" is the third episode of the show's 21st season.

Tweek's father tries to get him to calm down with a fidget spinner on South Park. "Put It Down" is the second episode of the show's 21st season.

The gang returned with some more laughs in Season 21.