Season 2 of Stranger Things will be released on Netflix later in 2017.
Harbour also spoke to the addition of actor Sean Astin, as a former classmate of Hopper and Joyce Byers.
Many 80s horror and fantasy movies were about kids on their own, with little to no help from adults.
He’s certainly not the first 80s star to join the cast of Stranger Things, Winona Ryder starred in several movies during the second half of the decade including Beetlejuice, Heathers, and Great Balls of Fire.