Season Four is the fourth season of Amazon's The Expanse and the first to air after the migration from Syfy to Amazon Studios. Amazon officially ordered Season 4 on May 26, 2018. The season premiered on December 13, 2019 and consisted of ten episodes that were all released at once.
The fourth season centers primarily on Cibola Burn. The season also retained viewpoints of Earth, Mars and the Belt in addition to those of the Ilus-centric viewpoints in the Cibola Burn novel. The Additional plots elements involving those characters is primarily borrowed from Nemesis Games and Gods of Risk.
With the Ring gates now open to thousands of new planets, a blood-soaked gold rush begins, igniting new conflicts between Earth, Mars, and the Belt. Meanwhile, on one unexplored planet, the Rocinante crew gets caught in a violent clash between an Earth mining corporation and desperate Belter settlers as deadly, new threats from the protomolecule emerge.
Special appearances by
|"New Terra"||Mark Fergus & Hawk Ostby||Breck Eisner||12/13/19|
|The crew of the Rocinante investigates a strange protomolecule ruin on an alien planet. Bobbie copes with civilian life on Mars. Drummer and Ashford battle with piracy in the Belt.|
|"Jetsam"||Laura Marks||Breck Eisner||12/13/19|
|Avasarala is blindsided while on a visit to Mars. The Roci crew continue their protomolecule investigation while tensions between the RCE and Belters reach a tipping point. Drummer and Ashford track down a terrorist.|
|"Subduction"||Dan Nowak||David Petrarca||12/13/19|
|New alien threats emerge on Ilus as Naomi battles health challenges on the planet. Bobbie searches for a missing person on Mars. Avasarala faces a new challenge in the UN.|
|"Retrograde"||Matthew Rasmussen||David Petrarca||12/13/19|
|Drummer and Ashford confront a dangerous person from Naomi's past. Murtry hunts down a target. Bobbie makes a life-changing confession.|
|"Oppressor"||Daniel Abraham & Ty Franck||Jeff Woolnough||12/13/19|
|As tensions on Ilus reach a boiling point, Holden reveals a secret. Avasarala debates Nancy Gao while an emergency on the Roci forces Alex and Naomi into action.|
|"Displacement"||Hallie Lambert||Jeff Woolnough||12/13/19|
|The Roci crew prepares for an incoming disaster on Ilus. Ashford and Drummer close in on an enemy within the Belt. Bobbie takes on a dangerous job.|
|"A Shot in The Dark"||Dan Nowak||Sarah Harding||12/13/19|
|Naomi and Alex work to keep the Barbapiccola in orbit amidst a power outage. Avasarala faces a tough decision. Holden and Elvi race to find a cure for a disease spreading on Ilus.|
|"The One-Eyed Man"||Dan Nowak||Sarah Harding||12/13/19|
|Avasarala faces fallout for the UN's military mission. Ashford and Drummer makes big decisions about their future within the OPA. A spreading illness on Ilus takes a toll on Amos. Alex and Naomi's attempt to rescue the Barb turns desperate.|
|"Saeculum"||Daniel Abraham & Ty Franck||Breck Eisner ||12/13/19|
|Holden and Miller race to save Ilus. Murtry puts his endgame into motion, putting the Roci crew's lives at risk.|
|"Cibola Burn"||Daniel Abraham, Ty Franck & Naren Shankar||Breck Eisner ||12/13/19|
|Ashford closes in on an enemy while uncovering a dangerous plot. Avasarala faces a crossroads in her personal and political life. The Roci crew works to reestablish life on Ilus in the wake of a deadly catastrophe.|
- Ring blockade run
- Conflict on Ilus IV
- Attack on Sentinel Nineteen
- Boarding the Pizzouza
- Mariner Valley shipyard bombing
- Tynan boarding of Granicus
Season 4 was the first season not to be broadcasted on live TV and not get weekly viewership ratings. The season ranked high as 4th in most wanted digital original in the United States in December 2019.
|Block||Episodes||Director's start||Photography||Director's end|
|1 "A"||1 - "New Terra"
2 - "Jetsam"
|August 29, 2018||October 1 through October 25|
|2 "B"||3 - "Subduction"
4 - "Retrograde"
|TBD||October 24 through November 18|
|3 "A"||5 - "Oppressor"
6 - "Displacement"
|TBD||November 17 through December 10|
|4 "B"||7 - "A Shot in The Dark"
8 - "The One-Eyed Man"
|TBD||December 9 through January 15
(holiday break December 22 through January 7)
|5 "A"||9 - "Saeculum"
10 - "Cibola Burn"
|December 13, 2018||January 14 through February 6||February 7, 2019|
- Chris Danelon created a short video, Mini Marines, which was to appear on a TV screen on Mars during Season 4's "The One-Eyed Man". However, this video was ultimately not chosen to be inserted into the intended episode.
- ign.com: Season 4 Release Date Announcement
- Tweet from Cas Anvar
- deadline.com: The Expanse Picked Up By Amazon For Season 4
- ew.com: Naren Shankar about Season 4
- ew.com: First look at season 4 concept art
- Internet Movie Database Ep403
- Tweet from Breck Eisner
- www.mediaplaynews.com: ‘Mandalorian’ Tops Parrot Analytics’ SVOD Originals Chart for 5th Week
- Tweet from The Expanse Production Office
- Tweet from The Expanse Production Office
- Marines #TheExpanse Animation - Chris Dandelion Youtube channel
- deadline.com: Rosa Gilmore, Keon Alexander & Jess Salgueiro To Recur In Season 4 (Feb 25, 2019)
- flickeringmyth.com: New cast additions announced (Feb 10, 2019)
- cbr.com: The Expanse Season 4 Filming Has Wrapped (Feb 08, 2019)
- tvguide.com: Season 4 Adds Key Character From the Books as Production Wraps (Feb 7, 2019)
- deadline.com: ‘The Expanse’ Picked Up By Amazon For Season 4 (May 25, 2018)
- hollywoodreporter.com: 'The Expanse' Revived for Season 4 at Amazon (May 21, 2018)