The Expanse

Season 4 · 10 Episodes

Season 4

201910 Episodes

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.

Episodes

The crew of the Roci 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.

Director

Breck Eisner

Written By

Mark Fergus, Hawk Ostby

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.

Director

Breck Eisner

Written By

Laura Marks

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.

Director

David Petrarca

Written By

Dan Nowak

Drummer and Ashford confront a dangerous person from Naomi's past. Murtry hunts down a target. Bobbie's makes a life-changing confession.

Director

David Petrarca

Written By

Matthew Rasmussen

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.

Director

Jeff Woolnough

Written By

Daniel Abraham, Ty Franck

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.

Director

Jeff Woolnough

Written By

Hallie Lambert

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.

Director

Sarah Harding

Written By

Dan Nowak

Guest Stars

Keon Alexander

Marco Inaros

Benz Antoine

General McCourt

Burn Gorman

Adolphus Murtry

Rosa Gilmore

Lucia Mazur

Lyndie Greenwood

Elvi Okoye

Jess Salgueiro

Chandra Wei

Patti Kim

Carol Chiwewe

Michael Benyaer

Arjun

Steven McCarthy

Jakob

Kyla Madeira

Felcia

Nathaniel McParland

Chike

Jarret Wright

RCE Guard Liam

Justin Michael Carriere

Angeletti

Madison Walsh

Campaign Manager

Ryan Turner

RCE Guard Eugene

Jamaal Grant

Barbapiccola Captain

Chai Valladares

Aide Diaz

Tara Rosling

Officer Adams

Adam Christie

Scared Belter

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.

Director

Sarah Harding

Written By

Dan Nowak

Holden and Miller race to save Ilus. Murtry puts his endgame into motion, putting the Roci crew's lives at risk.

Director

Breck Eisner

Written By

Daniel Abraham, Ty Franck

Guest Stars

Thomas Jane

Investigator

Burn Gorman

Adolphus Murtry

Rosa Gilmore

Lucia Mazur

Lyndie Greenwood

Elvi Okoye

Jess Salgueiro

Chandra Wei

Zach Smadu

Fayez

Steven McCarthy

Jakob

Kyla Madeira

Felcia

Nathaniel McParland

Chike

Christian Potenza

Mason

Mike Vitorovich

Security Officer

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.

Director

Breck Eisner

Written By

Daniel Abraham, Ty Franck