The group are able to flee the Department of Energy. Only one of them won't make it.
Will's connection to the shadow monster is tearing him apart, but no one can help. Dustin and Steve prepare to battle Dart.
Will's brought more back from the Upside Down. Little Dart is growing into something terrifying.
Dustin finds a weird new pet. Joyce inadvertently finds more evidence Will's still connected to the Upside Down.