BEGIN SLIDESHOW Riverdale season 3 sneak peek & 2018 highlight reel Straight from their San Diego Comic-Con panel, The CW has released a special 2018 highlight reel and Riverdale season 3 sneak peek. Check it out in the player below! Riverdale Season 3 premieres Wednesday, October 10 on The CW. Join Archie and the gang as they continue to dive into the secrets that loom and keep emerging from the shadows in a town that once seemed like a quiet, ordinary place.