In the series 16 finale, Cartman believes he can affect the outcome of the 2012 presidential election.

An icon is implicated in a doping scandal, so supporters start cutting off their symbolic wristbands.

The boys' plans to go trick-or-treating as their comic-book heroes, the Avengers, hit a snag when Stan's dad needs his son's help with a new business venture.

When Butters starts acting out at school, his parents realize it's time to tell him why he's not like all of the other kids. He must travel to a foreign place to learn the ways of his people. It will be a difficult trip for a young boy to make alone, so Butters chooses Kenny to travel with him to the distant and secluded island of Hawaii.

Kyle suspects that his mother is having an affair with a deliveryman; Cartman installs a home-security system.

Cartman finally comes to the realization that he's overweight, but declares that the solution is to ride around on a mobility scooter. Also: Cartman learns he has a rival in a young reality-TV star.

Randy's campaign to prevent head injuries in football radically changes the way the game is played, but the new rules become a national sensation and even make a South Park student a star athlete.

A romance for Cartman may finally become a reality when there's a new girl at school.

The boys try zip-lining in the Colorado mountains on the last day of spring break, but their adventure takes a dangerous, life-threatening turn.

Stan organizes an antibullying video when Butters is tormented by an unlikely predator.

The town's Easter-egg hunt may be canceled due to rumors of a vicious beast that Cartman claims to have caught on film.

An evolutionary development poses a grave threat to humanity.

Cartman targets a specific—and vulnerable—clientele when he starts his own shopping channel for gems, while Stan researches the value of a piece of jewelry that was a gift from his grandfather.

Tragedy strikes when one of the boys repeatedly ignores reminders about leaving the toilet seat up in the Season 16 premiere.