Can you finish the #ATLA alphabet? Join Netflix's #AvatarTheLastAirbender cast — Gordon Cormier (Aang), Elizabeth Yu (Azula), Kiawentiio (Katara), Dallas Liu (Zuko), Ian Ousley (Sokka), and Miyako Cech (Toph) — for a chaotic photo card decorating session now live on A*Pop on YouTube! #abcchallenge