Well, SP is a bit rude, so I will try to put a summary of that episode politely.
“Cat whizz causes hallucinations, so Kenny becomes an addict.
The practice is known as “cheesing”. Rather gross how you get the cat whizz. the hallucinations resemble the old movie, “Heavy Metal”. Cats get banned and Cartman hides cats ala Anne Frank. All turns out we in the end, of course.”