S4, E10: As Riverdale High prepares for the championship football game against Stonewall Prep, Betty (Lili Reinhart) gets to work on a story about the rivalry between the schools. Archie (KJ Apa) is conflicted when Mary (guest star Molly Ringwald) tells him about Uncle Frank’s (guest star Ryan Robbins) troubled past. Cheryl (Madelaine Petsch) goes head to head with Ms. Appleyard (guest star Emily Tennant), the school’s new cheerleading coach, and Veronica (Camila Mendes) hits a road block with her latest Luna Rum recipe.