As Riverdale High begins rehearsals for its upcoming production of “Carrie the Musical”, the arrival of an ominous letter forces director Kevin to make a difficult decision about the show. Jughead uses his cover as the musical’s documentarian to solve the mystery behind the letter. Meanwhile, tensions between Betty and Veronica continue to escalate just as Alice announces she is joining the musical to spend more time with Betty. Elsewhere, Hiram enacts a devious plan to further drive a wedge between Fred and Archie, while Cheryl channels Carrie White during a showdown with her mother.

With Riverdale in disarray following Hiram’s takeover, Veronica leads the charge against her father after he takes aim at La Bonne Nuit. Meanwhile, as Betty reluctantly houses the group of patients who escaped the Sisters of Quiet Mercy, Jughead confronts a group of desperate Serpents, who have resorted to drastic measures to make ends meet. Finally, Archie is forced to face his demons.

Archie’s plan to host a peaceful Thanksgiving dinner at the community center quickly gets derailed when some unexpected guests arrive. Stranded at Stonewall Prep by an ice storm, Jughead and Betty search for clues about a recent death on campus. Elsewhere, while FP, Alice, Hiram and Hermoine wait out the storm together at Pop’s, Cheryl and Toni get resourceful as they host a dinner for Cheryl’s family.

A big announcement forces everyone to take stock of their current lives. Cheryl sets a risky plan in motion after learning some surprising news about Toni. Jughead tries to make sense of a strange encounter he had. Kevin and Fangs make a big decision about their future together.

As Bailey's Comet passes over Rivervale, Cheryl and Nana Rose revisit the tragic stories of the Blossom women through the years. Meanwhile, the once-in-a-lifetime celestial event prompts Cheryl to summon a familiar face to Rivervale - Sabrina Spellman.

After learning that Percival is exploiting his new work crew, Archie and Tabitha devise a plan to help protect the workers and get them out from under Percival's control. Meanwhile, Jughead finds himself with a target on his back after Percival catches wind of a scheme he and Veronica hatched against Reggie. Finally, Betty receives some unexpected news about a dark moment from her past, and Toni and Fangs find themselves at a crossroads.