Millie Bobby Brown was forced to miss a 'Good Morning America' appearance with a 'Stranger Things' co-star due to an injury. She also skipped a private 'Stranger Things' finale screening, as well as another 'Stranger Things' event, with some reports suggesting co-star David Harbour was also absent. The nature and extent of Brown's injury are not specified, and it is unclear if Harbour's absence is related to a feud or an injury.