Archie gathers his friends together to talk about Percival Pickens. They discuss his family history and why he was brought to town.

Cheryl tells Betty the truth about Polly returning in secret.

Jughead has a theory that he opened up a portal in the bunker. He tells Tabitha his theory based on all the people he encountered in the bunker. Jughead thinks he's been opening portals when his mind-control abilities were going haywire.

Jughead thinks the answer to Percival, their powers, and the connection won't be found in Riverdale. He wants Tabitha to jump into a portal with him.

Percival uses his ability to brainwash Alice into doing a broadcast interview with him. He plots to kill Marty, Reggie, and Kevin in a live execution.

The execution will be held at the Babylonium. Frank and Sheriff Keller kick Veronica out of the casino.

Betty is reunited with Polly at Thornhill. She faints.

Jughead opens a portal for him and Tabitha to jump through. They end up in Rivervale, where the Rivervale Jughead explains how the stories Jughead wrote were from RV Jughead.

Rivervale Jughead explains that the separation of Riverdale from Rivervale caused Rivervale to crash in on itself and people died. Rivervale Jughead has to work at a typewriter to keep the universe alive.

Rivervale Jughead never heard of Percival Pickens. Jughead and Tabitha think the Rivervale universe is bleeding into Riverdale to make things more chaotic. Rivervale has another doppelganger of Tabitha and Jughead living in their world.

The bunker Jughead warns them to not interact with their Rivervale counterparts.

Percival Pickens conducts his interview with Alice. He explains that his family came in the ship to Riverdale. He was there during the arrival and conducted in witchcraft. Percival was discovered and sentenced to death.

Percival explains his ritual was to contact the devil. He sold his soul to get his freedom.

Betty has a tearful reunion with Polly. Polly tells her that she's worthy of heaven and no one can tell her otherwise.

Veronica hacks into the casino security cameras. She watches as Reggie, Marty, and Kevin try to escape the vault by holding Sheriff Keller hostage. They let him go when Frank says he'll kill Tom regardless.

Jughead and Tabitha visit Thornhill; they find out that Cheryl's body has been left lifeless as Nana Blossom's soul brought on her ailments.

Britta wants Jughead to sign a comic book of "Super Teens." The heroes look like everyone on Riverdale.

Cheryl conducts a painting of Jason; he spills why Percival is creating a ghost train. Percival plans to rally and recruit spirits to fight in the war of Good Vs. Evil. Veronica calls them to explain the upcoming public execution of Marty, Reggie, and Kevin; she doesn't think there's enough time to save them and blow up the train tracks.

Betty has a nightmare of being the Harlot of Babylon. She and Polly have a chat about why Betty thinks she's the Harlot. Polly tells her to forgive herself about killing Caramel the cat, her kissing Archie in high school, and her falling out of love with Jughead.

Betty thinks she's marked and evil in her DNA. Polly has an idea to help her.

Tabitha needs the other Jughead so they can get into Pop's.

Percival continues his interview; he explains that he went from town to town to steal precious information. He's originally from Rivervale universe and had planned to take back that town, but he was magically transported to Riverdale. He decided to stay in Riverdale because he had powers and could easily take over the town. But, everyone started getting powers.

Percival believes his slipping into Riverdale was what caused everyone to get powers.

Polly washes Betty's feet and says that her serial killer gene is gone. She says that someone did the same for her, which allowed her to enter The Sweet Hereafter.

Tabitha conducts a rift with her Rivervale counterpart; she lures Rivervale Jughead to meet with her and Jughead. The Super Teens were created by him and given their powers.

Rivervale Jughead's next comic book will be the death of the Super Teens by "Percy The Perverse". His agreement with Mr. Cypher forced him to make stories of a deadly and depressing nature.

Mr. Cypher is at the Babylonium to play a chess tournament for the ultimate good.

Betty notices her glowing gold aura in the mirror.

Mr. Cypher wins his chess match against Raphael. Tabitha is worried because everything in Rivervale is happening in Riverdale.

Mr. Cypher reveals that Rivervale/Riverdale is built over a Hellmouth. Pop's Chock'lit Shoppe is the location of the Hellmouth, which is why Percival wanted that location all along. Mr. Cypher says that the battle of Good vs. Evil was Percival's way of taking over the town.

Percival tells Alice that his ultimate goal is to control everything. He wants to control the living and the dead under his rule. Alice is visibly worried on camera.

Ethel is upset that Rivervale has bled into Riverdale. Ethel reveals that Jughead's call to Betty, which saved her and Archie's lives in the explosion, caused the fissures and leaks of the universes. Ethel is mad at Bunker Jughead for getting involved; Jughead and Tabitha return back to Riverdale.

Jughead uses his new portal powers to get Marty, Reggie, and Kevin out of the vault.

Archie blows up the train tracks.

Percival sends a text message to the group; it includes a picture of Alice, Frank, and Sheriff Keller by the guillotines. A mass text is sent out that all three were executed as retribution.