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In this sci fi series, the crew of a interplanetary space ship works to solve mysteries and maintain the fragile political balance in a solar system that has been fully colonized from center to edge. Thomas Jane and Steven Strait star. The series aired on Syfy from 2015 to 2018, and Amazon Prime committed to producing a fourth season.

Wednesdays 10:00 PM et/pt on Syfy
4 Seasons, 46 Episodes
December 14, 2015
8.5/10
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The Expanse Full Episode Guide

  • 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.

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

  • 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.

  • 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 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.

  • 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.

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

  • 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.

  • 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.

  • 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.

  • Holden and his allies must stop Ashford and his team from destroying the Ring, and perhaps all of humanity.

  • As survivors arrive to the Behemoth, two factions form over how to handle a life-or-death threat; Holden grapples with what he's seen and the choices he must make.

  • Drummer and Ashford find themselves trapped with few options for survival; Anna tends to the wounded masses as Melba continues to hunt down her prey; the Rocinante crew struggles to survive as Naomi reunites with her true family.

  • Holden sees past, present, and future; a ghost from Melba's past threatens her mission; Bobbie struggles to trust an old friend as she leads a group into uncharted territory.

  • The Rocinante seeks a new game plan as they attempt to avoid capture; Melba's true motives are revealed; Naomi is torn between identity and ideal; Anna seeks a way to stay aboard the Thomas Prince.

  • An old friend taunts Holden with the answers he seeks; Naomi struggles to fit in; a mysterious low-level tech aboard the Thomas Prince enacts a terrifying plan.

  • All eyes turn to the edge of the solar system as a mysterious new presence emerges; Naomi recommits to her roots; Drummer butts heads with a seasoned new commander aboard the Behemoth; and a young Belter makes a name for himself.

  • The final battle between Earth and Mars threatens the very future of humanity; a new monster is unleashed on Prospero Station; Anna receives the smoking gun she needs.

  • The search for Prax's daughter comes to a head; Admiral Souther's men plan for mutiny aboard the Thomas Prince.

  • The Rocinante tends to wounded Martian soldiers in exchange for supplies; Avasarala struggles with how to disseminate a key piece of evidence despite being in hiding.

  • Earth strategizes a costly ploy to gain advantage in the war against Mars; Anna struggles to convince Sorrento-Gillis to do the right thing; Avasarala and Bobbie seek refuge aboard the Rocinante.

  • The Rocinante answers an unexpected distress signal; Bobbie and Avasarala find themselves being hunted by a mysterious captor; UN Secretary-General Sorrento-Gillis brings in a colleague from his past to lend an ear during this crucial time of war.

  • The Rocinante crew deals with the fallout over Naomi's betrayal while caught in the middle of the war between Earth and Mars. Avasarala and Bobbie hatch an escape plan.

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The Expanse is available to watch and stream on Syfy. You can also buy, rent The Expanse on demand at Amazon Prime, Amazon, Vudu, Microsoft Movies & TV, Google Play, iTunes online.