One of the boys had been told time and time again about leaving the toilet seat up after he goes to the bathroom, but he didnt listen. His actions have consequences and ultimately result in an unimaginable catastrophe.

Cartman launches a gemstones network show and creates a very lucrative business. Stan searches for the real value of a piece of jewelry that was a gift from his Grandpa. Meanwhile, Cartman's lucrative new business preys upon an extremely vulnerable clientele.

Mankind's evolution begins to accelerate at a rapid and disturbing pace. Concurrently, another species on the planet is exhibiting the same drastic development. Eventually the two species will battle to the passing and "Faith Hilling" may be humanity's only hope.

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

Stan wants to raise awareness about the dangers of bullying by shooting a big dance video. Will he be able to handle the pressure that goes along with the notoriety of taking on such a worthy cause?

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.

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

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.

Cartman owns up to being fat and decides that driving around on a scooter is his right. Kyle sees that Cartman isn't the only one who finds no shame in his unhealthy lifestyle. Meanwhile, Cartman discovers he has a rival in America's Sweetheart, Honey Boo Boo.

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

Butters' obstreperous behavior gives his parents a reason to tell him why he's not like the other kids, so he asks Kenny to accompany him on his journey of self-discovery to Hawaii.

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.

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

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