Joyce seeks help from Hopper after Will exhibits strange symptoms, giving them a new clue to the Upside Down’s threat to Hawkins. Nancy and Jonathan get themselves taken into custody by Hawkins Lab, and Eleven is grounded following a powerful fight. Meanwhile, Dustin realizes the horrible truth about his new pet, Dart.
U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.