When an experiment to save Barry's speed backfires, Nash Wells searches for a way to save The Flash and comes up with a dangerous plan. Meanwhile, Iris makes a startling realization inside the Mirrorverse and Cecile faces off with Rosa Dillon.
Archie, Betty, Veronica and Jughead prepare for their first day as Riverdale High's newest teachers. Veronica introduces her husband Chad to the group after he shows up unexpectedly in Riverdale. After realizing they are out of funds, Archie and Toni turn to Cheryl for help restarting the football and cheer teams. Finally, Betty, Kevin and Alice follow a lead after learning that Polly may be in trouble.
After tragedy strikes the Boulder Free Zone, Mother Abagail tasks members of her Committee with a dangerous mission. Meanwhile, Harold and Nadine begin their journey to New Vegas to unite with Flagg and claim their reward.