The Mayor has evidence that Randy blew up his neighbor’s yards in protest over homegrown weed and then blamed it on a Mexican Joker. Now the citizens of South Park have had enough of Randy and Tegridy Farms and they just want to lock him up.
The episode begins with Randy and Towelie discussing "tegridy" breakfast on one of their shows, when all of a sudden, two agents and some cops enter the scene and arrest Randy. He then enters the Mayor's office where Mayor McDaniels, along with Mr. and Mrs. Tweek and Mr. Mackey, have a conversation about Randy's "crimes". The Tweeks show Randy video evidence of him peeing and pooping on their homegrown weed, and even sticking a bomb in its dirt. McDaniels tells Randy that the town has had enough of his farm, and decide to lock him up until the trial.
Meanwhile, the boys play a game of football, but it all goes awry when Eric Cartman throws the ball to Jason White, who gets accidentally ran over and killed by a police officer. It results in a funeral for Jason, where the priest says that his "playfulness in sports" got him killed, much to the parents' dismay. Bob White comes up to the podium and gives everyone a piece of his mind why there should be protests for this sort of thing, instead of the incarceration of Randy.
Back at Tegridy Farms, Sharon Marsh has a conversation with Stan Marsh and his sister Shelly Marsh about Randy's arrest. She tells them that if Randy is really gonna be in jail forever, they would finally sell the farm and move back to town, even forget about the marijuana business along with Randy.
Elsewhere in Washington D.C., Mr. Garrison gets a phone call from Randy, telling him that he needs help to get out of trouble. Garrison suggests the DARVO technique: Deny, Attack, Reverse Victim and Offender. They role-play the tactic, which seems to work for Randy. Garrison ends the phone call by telling him that he'll take care of the problem.
Back at the farm, Sharon throws a party in the living room, which includes all the pictures of Randy and marijuana taken down. Linda Black asks Sharon what will happen if Randy finally gets put away, and she responds with making a long list of things to do while celebrating. Suddenly, the Whites show up crashing the party by saying that Sharon and her friends support the Marsh family in their time of need instead of their son. That also reveal that they were Tegridy Plus members, and they believed in Randy.
Realizing that nothing is right, Cartman comes up to the Whites and tells them that there is a way to make their lives right: adopt a child from the Texas detention center. When they arrive, they look around to find the right kid for them. They come across Alejandro, and they accept him as there own by asking, "How would you like to be a White?"
At prison, Randy tries to convince the doctor to give him weed to heal his symptoms. The symptoms he has are questioning what he has did and why he deserves this punishment. The doctor says that reality was coming back to him, and it was his wake-up call for abusing drugs. Randy uses the DARVO technique on the doctor, but to no avail.
At the Whites' residence, Alejandro and the family are watching TV while he questions the whereabouts of his real parents. Bob tells him that being one of them is hard when people don't cane about what's happening to them. Then they watch the news broadcast about the false charges against Randy and Tegridy Farms while Alejandro uses Bob's phone to call Mexico. Bob take the phone back and says that it's past phone use time and they don't call long-distance.
Back at prison, Randy tells everyone in a therapy session that he realized what behavior pattern he had. He says that the President told him to deny everything and make himself the victim. he ends the session by saying that he's not and never will be as bad as the President.
The next day, the Whites protest at a market, telling everyone to call off the persecution. Alejandro doesn't participate, even though Bob says that they're not gonna stop unless they chip in. Mrs. White knows that Alejandro doesn't appreciate them, and they decide to go adopt another child from the detention center. They find a Panamanian boy and add him to their family so there would be more of them to stop the false accusations.
Late at night, Randy gets a secret visitor. He heads to the visiting room, only to find President Garrison's assistant, Rudy Giuliani. Giuliani starts to help Randy, even though he was gonna plead guilty, by smuggling a joint and offering it to him.
The day of the trial comes as protesters plead to lock Randy up while the Whites plead to release him, since they think it's a waste of the taxpayers' money. Bob realizes that Alejandro doesn't have sunscreen on, and forces him to wear it, making him a little similar to the Mexican Joker.
At the City Hall, Randy begins to rant at the crowd that he was setting up a trap for the Mexican Joker. When he tries to finish the rant, he begins to realize what he's doing wrong, and admits that Garrison set him up so he can be the victim. Randy also says that the reason why he wanted the business in the first place is to make quality weed that was perfect. He also says that tegridy weed is a community, and about family. He declares not to fight and do his time, so he can reform and go back to making weed.
Just then, explosions are heard as Alejandro begins to cause havoc while looking like the Mexican Joker. The Whites try to intervene, but the police begin shooting while he makes his escape. Back at City Hall, Randy is relieved to have the charges dropped, and the town accepting him and Tegridy Farms again. He takes the opportunity by thanking those who have been there for him, including the Whites, and leaves to go tend his farm.
Back at the farm, things begin to go back to normal as Randy collects the remaining crops as winter begins, while Sharon, Stan, and Shelly feel miserable, now that their hopes were crushed. Randy cheers them up by saying that this season has been a good run. He then thanks the audience for enjoying it, and offers some limited-edition weed form the last crop, while pre-orders for next season begin.
AV Club gave "Season Finale" a "B" rating saying: "Season Finale was an enjoyable episode, and while it let Randy off the hook a little too easily, its well-executed twist ending, and the memorable return of Trump/Garrison made it quite a worthwhile affair."