Riverdale Flashback: Watch Our First Interviews With the Cast in 2016! (Exclusive)

This blast from the past is sweeter than one of Pop's milkshakes! Watch ET's first 'Riverdale' interviews with Luke Perry, KJ Apa, Cole Sprouse, Lili Reinhart  and Camila Mendes. Season 4 of 'Riverdale' premieres Wednesday, Oct. 9 at 8 p.m. on The CW. Exclusives from #ETonline :    • NEW From Entertainment Tonight