Stranger Thingsin neljäs kausi on alustavien huhujen mukaan mittavampi kuin aiemmat kaudet, ja nyt asiasta on saatu virallinen varmistus. Tulossa on kaikkiaan yhdeksän jaksoa, joista jokaisella on kestoa yli tunti. Aiemmilla kausilla kestoa on ollut 45 minuutin verran jaksoa kohti. Neljännen kauden viimeinen jakso kestääkin sitten yli kaksi tuntia.
Tilannetta hehkutti Matt Duffer, joka on yksi sarjan luojista. Neljäs kausi saa ensimmäisen osuutensa linjoille 27. toukokuuta, ja se jälkimmäinen saadaan sitten 1. heinäkuuta.
"A lot of it had to do with the fact that we had characters spread out in three locations and we had a lot more plot. It must be quadruple the plot we had in Season 3. That was our fun blockbuster season. This season we knew that Season 5 was going to be our last, we had to start revealing a lot."
"The more we were writing, the more we realized we need more time in order for these reveals to land, in order for these storylines to work. Partway through we knew we needed to ask Netflix for nine episodes instead of eight and as we started shooting we realized, Oh are these mega-long episodes. Seven and nine in particular are movies. And nine is a long movie."