The narrative link between the two specials is held together by a bizarre, pseudo-scientific concept: "The Fluid." The show posits that time travelers bleed "The Fluid" into the past, which solidifies into a tangible object. When the boys arrive in March 2020, they accidentally drop "The Fluid" in the South Park Elementary School bathroom.

In , the boys are all grown up. Stan lives a lonely, cynical life as an online whiskey consultant; Kyle is a lonely, cynical advice counselor; Cartman has converted to Judaism and become a Rabbi (much to Kyle's annoyance); and Kenny has become a famous scientist. Kenny has discovered the secret to time travel and plans to go back to the past to fix the future.

The most important thing to know is that this is not a standard TV episode. It is a made-for-streaming movie. To watch it legally and in the highest quality, you need to head to .

IGN Review: South Park: Post COVID Review – "A Dark, Mature Turn for the Series" https://www.ign.com/articles/south-park-post-covid-review

https://www.paramountplus.com/shows/south-park/video/Oj3ZvZvV3F7ZvZvZvZvZvZ/south-park-post-covid/ (Note: Direct link may vary by region; search "South Park Post COVID Paramount+" if needed)