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 10 of 12 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 10 Previous Next Start Slideshow Halloween Costumes 2019RiverdaleHalloween EntertainmentHalloween CostumesHalloweenTV