Popsugar Entertainment Halloween Costumes 2019 Riverdale Season 4 Halloween Episode Pictures Cheryl and Toni Couple Up as Poison Ivy and Harley Quinn in Riverdale's Halloween Episode 22 October 2019 by Kelsie Gibson View On One Page Photo 8 of 12 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 8 Previous Next Start Slideshow Halloween Costumes 2019RiverdaleHalloween EntertainmentHalloween CostumesHalloweenTV