CW | 9:00 pm

As Bailey's Comet streaks over Riverdale, Cheryl (Madelaine Petsch) and Nana Rose (guest star Barbara Wallace) reminisce about past tragedies that have befallen Blossom women over the years in the new episode "Chapter Ninety-Nine: The Witching Hour(s)." The celestial event prompts Cheryl to summon a familiar face — Sabrina Spellman (guest star Kiernan Shipka) — to Riverdale. Lili Reinhart, Camila Mendes, Cole Sprouse and Casey Cott also star.