Chief Hopper was brought back in season four and adjustments were needed for continuity purposes. David Harbour, the actor who plays Hopper, lost quite a bit of weight since season three so one of the show's makeup designers, Barrie Gower, used prosthetics to give his face a fuller look. "I hate prosthetics, but Barry/team made it as painless as possible," Harbour wrote on Instagram. "The results speak for themselves. Shoutout to @amylforsythe as well who has been our makeup dept head since s1, for augmenting, overseeing and being all around generous with the process."
