The sixth season of Riverdale returns on The CW on Tuesday, Nov. 16, at 9 p.m. ET for a special five-episode event before taking its annual midseason hiatus. Shipka will reprise her role as Sabrina in the fourth episode of season six (the 99th episode of the series overall). Written by Roberto Aguirre-Sacasa and directed by Gabriel Correa, the episode is titled "The Witching Hour(s)." Since the show will run for five weeks, it's safe to assume it will premiere on Tuesday, Dec. 7, at 9 p.m. ET.