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Cast and characters
- Winona Ryder as Joyce Byers
- David Harbour as Jim Hopper
- Finn Wolfhard as Mike Wheeler
- Millie Bobby Brown as Eleven
- Gaten Matarazzo as Dustin Henderson
- Caleb McLaughlin as Lucas Sinclair
- Noah Schnapp as Will Byers
- Sadie Sink as Max Mayfield
- Natalia Dyer as Nancy Wheeler
- Charlie Heaton as Jonathan Byers
- Joe Keery as Steve Harrington
- Maya Hawke as Robin Buckley
- Priah Ferguson as Erica Sinclair
- Cara Buono as Karen Wheeler
- Brett Gelman as Murray Bauman
|26||"The Hellfire Club"||The Duffer Brothers||The Duffer Brothers|
Following the release of Season 3, the Duffer Brothers stated that if Stranger Things was renewed for the fourth season (renewal was confirmed two months later), the season would be very different and they would explore newer locations outside Hawkins in order to "open up plot-lines". They also confirmed that the season would address the mid-credits scene of the finale of the third season.
In early February 2020, it was reported that the season's length had been to extended to nine episodes, to set up a fifth and final season. However, the report has yet to be officially confirmed. 
In mid-February, in addition to releasing a teaser trailer, the Duffers revealed the return of Jim Hopper who's now imprisoned in Kamchatka likely confirming that he is the American prisoner discussed in the end credit scene of season 3. They added that the season would be the "most frightening yet" with "a new horror" emerging that would connect everything.
In an appearance at Liverpool Comic Con, actor David Harbour teased that Hopper's backstory will be explored in the upcoming season. Actor Joe Keery stated that the fourth season would be "a lot scarier" than previous seasons. Actress Sadie Sink has confirmed that the Party will now be entering high school this season.
According to a report made by TV Line, Season 4 was slated to begin filming in January 2020 and would likely wrap in August. 
Following the release of a teaser on February 14, the Duffer brothers confirmed that filming for the fourth season had already begun.
According to a listing in Production Weekly, the season is being filmed under the working title "Tareco".
Shooting took place in Vilnius, Lithuania before moved back to Atlanta.
According to stunt co-ordinator Hiro Koda, two episodes of the season were filmed before production was halted for the pandemic.  On July 2, 2020, it was announced that production on the fourth season would tentatively resume on September 17, 2020.
Effect of COVID-19 outbreak
Following the outbreak of the pandemic COVID-19, Netflix decided to halt production on all its films and TV series, including the fourth season of Stranger Things on March 13, 2020, for at least two weeks. Filming is said to resume in August/September of 2020, though if not, the release date shall be pushed to the end of 2021.
- This is the second season to have a one-year time gap in production, as season 2 and 3 had a year and a half time gap (though the gap between Season Three and Season Four is due to the pandemic).
- This is the second season to have nine episodes since Season 2.
The first teaser trailer was released on September 30, alongside the season's official announcement.
A clip from the fourth season was released on February 14, 2020, which confirmed the fate of Hopper.
A teaser trailer showing the Season 4 table read was released on March 3, 2020.
- ↑ Twitter post from the official writers' account
- ↑ "Stranger Things 4 officially announced with new teaser" Entertainment Weekly. September 30, 2019
- ↑ http://rs.n1info.com/Showbiz/a585520/Nikola-Djuricko-u-Stranger-things.html
- ↑ "Agents of SHIELD's Joel Stoffer to Appear on Stranger Things (Exclusive)"Comicbook. July 1, 2020.
- ↑ Chapter One title revealed via the show's writers
- ↑ ""
- ↑ ‘Stranger Things 4’ First Look Trailer Confirms David Harbour’s Hopper Is Alive and Returning"Indiewire. February 14, 2020.
- ↑ David Harbour: Hopper’s ‘Stranger Things’ Return Includes ‘Huge’ Backstory RevealIndiewire.. May 5, 2020.
- ↑ "‘Stranger Things’ Ups Priah Ferguson to Series Regular for Season 4 (EXCLUSIVE)" Variety. February 21, 2020.
- ↑ ‘Stranger Things’ Season 4: ‘Fleabag’s Brett Gelman Upped To Series Regular" Deadline. March 3, 2020.
- ↑ Cite error: Invalid
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- ↑ "Stranger Things Season 4 Working Title Revealed"Comicbook. December 9, 2019.
- ↑ "Stranger Things: Stunt Coordinator Hiro Koda Teases “Darker” Season 4, Explains How Social Distancing Will Affect Stunts "Comicbook. May 23, 2020.
- ↑ ‘Stranger Things,’ Producers on Shutting Down: ‘It’s Bittersweet’"Variety. March 18, 2020.