Behind the Scenes of 'Riverdale' Season 4 (PHOTOS)

Meredith Jacobs

Riverdale's fourth season may not be premiering until October, but the cast has already begun filming and sharing looks behind the scenes at what to expect.

It all begins with the emotional premiere, which pays tribute to the late Luke Perry and his character, Fred Andrews, and features a special guest star in his Beverly Hills, 90210 costar, Shannen Doherty.

'Riverdale' Cast Teases Season 4, Jughead's Possible Death & Senior Year (VIDEO)

'Riverdale' Cast Teases Season 4, Jughead's Possible Death & Senior Year (VIDEO)

KJ Apa, Lili Reinhart, Cole Sprouse, Camila Mendes, and Madelaine Petsch talk the bonfire finale scene, Cheryl's state of mind, and more.

Click through the gallery above to see the photos the cast and producers have shared on social media from the set.

Riverdale, Season 4 Premiere, Wednesday, October 9, 8/7c, The CW