I do have a couple theories for what happens next, both equally retarded, but here it goes.
The episode will take place after Garrison loses the election, and all the adults are divided. The anti-maskers and maskers still engage in fist fights with one another on a regular basis, and all of Garrison's supporters riot and fight with the police. Token is still at the hospital, but is expected to be released soon.
With the numbers rising in South Park, the adults grow fearful and begin burning down buildings and rioting even more. Eventually, this escalates to the point that either some of them get arrested, while others leave town (this is partly inspired from what's happening right now with Covid numbers rising).
Meanwhile the kids, still in hiding, are revealed to have been hiding in the sewers. They sought refuge underground, squatting secretly in an abandoned subway relay station, connected to a sewer and an abandoned subway tunnel. The underground subway station was also connected to the sewers, so that was one route the kids could have taken to the surface, or to return to the sewers, albeit, they had to remain undetected when moving through the subway station. The kids improvised by turning it into a large home, and they have staying there for the past couple of months. However, due to the large number of them, there was not much room for them to sleep and thus some of them had to share sleeping bags. When it got cold, they all huddled up and slept together, as their body heat combined provided warmth.
While spending most of their time underground, they would occasionally go up to the surface for food and drinks. They would steal pizzas, noodles, chicken, etc. They would also take drinks and toothpaste, along with a fresh sink to brush their teeth. However, stealing from grocery stores and restaurants was a bit difficult, because now every store in South Park had installed security cameras. They had to climb through the ventilation system and manually disable the cameras. They had to improvise with the internet. Kevin Stoley was generally the most tech savvy one out all the kids, so the Wi-fi was mostly his responsibility to look after. Also, much to their disgust, they would also farm algae, worms, and other insects. However, freshwater algae is generally toxic, so they had to boil it to be safe. Any toxicity found in the algae would be forced through a semipermeable membrane that separates it from the algae. When they weren't stealing food, it was the boys' jobs to go hunting while the girls cooked and cleaned. They also naturally had this motherly instinct to look after the younger kids. One time is the boys turn to go scavenging and Cartman, Stan, Kyle, and Kenny poke their heads out of the sewers after opening the manhole cover, with their positions parodying the 1990 Teenage Mutant Ninja Turtles poster.
Unbeknownst to them, one wastewater treatment plant worker spotted them and called the police. Harrison Yates, feeling lazy, made no effort to try to rile them all up and instead came up with a atrocious plan. He borrowed a large truck from his father-in-law and filled it with chlorosulfonic acid, which is currently being viewed as largely abhorrent because it reacts violently with water. If it gets poured into the sewers, it will incinerate their lair and kill them in seconds.
The police officers poured the acid into the sewers, but two of the kindergartners took notice of this real quick and warned the others. Luckily, they all escaped through the pool that provided an emergency exit in case of emergencies on the left-hand side of the lair. They each had their own individual snorkels just in case of emergencies. All of them swam and navigated through the underwater passages but the current became really strong at one point. Half of them were pulled into a separate tunnel as the others kept going straight. Among those who went straight the four main characters were one of them, Stan took the lead as they went up and down in roller coaster-like motion while in the pipes. Stan smashed into a large pipe shroud with the all others behind him crashing into him. With the help of Cartman, Kyle, Kenny, and Francis, they all smashed open the shroud of the sewer pipeline only to be introduced to more water. They swam up quickly and made their way to the surface. They also reunited with the other half of the group who got separated, as they were on the east side of the pond. They all swam to shore. As Stan and Kyle started doing a head count to make sure everyone was there, Cartman pointed out that the whole town was a ghost town; there were burned down buildings, wildfires, and houses that looked decaying. There was not a single grown up in sight. Even the police officers were gone, as they had retreated after pouring the acid, because that barbarous act was a amalgamation of pure laziness, and a hurry to get out of town.
As they seemingly explored all of South Park the kids began arguing, they accused one another of being a traitor. This went on for quite one time until they all decided to go their separate ways, as they did not trust each other. They all divided into four groups, one on the north side, one on the west side, one the east side, and one the south side, with each of them building their own sanctuaries.
Anyways, that's all I can think of what did you think of it? Do you think any of this will happen? Do you have any ideas? Share your thoughts.