CW | 8:00 pm

After she discovers there is palladium underneath her maple groves, Cheryl (Madelaine Petsch) seeks help from Archie, Kevin, Fangs and Reggie (K.J. Apa, Casey Cott, Drew Ray Tanner, Charles Melton) in the new episode "Chapter Ninety: The Night Gallery." Meanwhile, Alice and Betty (Madchen Amick, who also directed this episode, and Lili Reinhart) confront a trucker who may have been involved in Polly's disappearance. Jughead (Cole Sprouse) and Archie each reflect on events from their past.