"Stranger Things 2" picks up in 1984 and the citizens of Hawkins, Indiana are still reeling from the horrors of the Demogorgon and the secrets of Hawkins Lab. Will Byers has been rescued from the Upside Down but a bigger, sinister entity still threatens those who survived. Watch BUILD host Millie Bobby Brown, who plays the role of Eleven, when she stopped by to speak on the series that became a phenomenon.