Chapter One Hundred and Seven: In the Fog Riverdale : Season 6 Episode 12

After uncovering what Percival has planned for the town, Archie, Betty Jughead and Tabitha devise a plan to oust the current town council and instate their own. But when Percival catches wind of their secret meeting, he and Alice use an upcoming weather event to scare the town into staying in their homes... while they carry out the next step of Percival's master plan.