With palladium acting as his personal kryptonite, Archie decides he must build up his tolerance if he's going to stand a chance against Percival. Betty turns to Jughead for help uncovering some repressed memories from her childhood. Meanwhile, Veronica deals with a bombshell discovery that effects how she interacts with people around her, and Cheryl debates whether she should reach out to a former childhood crush.
Elenco: K.J. Apa , Lili Reinhart , Camila Mendes , Cole Sprouse , Madelaine Petsch , Mädchen Amick , Casey Cott , Mark Consuelos , Marisol Nichols , Ashleigh Murray , Charles Melton , Vanessa Morgan , Skeet Ulrich , Luke Perry , Erinn Westbrook , Drew Tanner .