'Stranger Things' Season 4: David Harbour and Wynonna Ryder React to Hopper and Joyce's Reunion

Winona Ryder, David Harbour and Brett Gelman open up to ET's Will Marfuggi about where we find Joyce, Murray and Hopper in season 4 of 'Stranger Things,' and if they'll make it back to Hawkins. The first seven episodes of season 4 are now streaming on Netflix.