The Expanse - Episode Guide

In the asteroid belt near Saturn, James Holden and the crew of the ice freighter Canterbury investigate a distress call from a mysterious derelict ship, the Scopuli. On Ceres, Station, Detective Miller begins an off-the-books investigation of a missing heiress, Julie Mao.

Holden and crew fight for survival in a badly damaged shuttle. Miller uncovers clues about Julie Mao, as water rationing hits Ceres Station. On Earth, UN Deputy Undersecretary Chrisjen Avasarala interrogates a Belter terrorist.

Holden and crew are taken prisoner aboard the Donnager, the flagship of the Martian Congressional Republic Navy, and begin to turn against each another. While contending with riots on Ceres, Miller connects Julie to the mysterious derelict ship, the Scopuli. Avasarala engages in a nasty game of politics with an old friend.

Holden and crew are caught in the middle of a desperate battle, as mysterious warships attack and board the Donnager. As he pursues Julie Mao, Miller's partner, Havelock, goes missing.

Holden and crew make a deal with an unlikely ally on Tycho Station. Along with his conspiracy theories about Julie Mao, Miller's obsession with the missing girl intensifies.

Miller discovers revealing information on a hidden data cube. Holden and crew arrive at Tycho Station, surprised by their host's hidden agenda.

Holden and crew realize they're not alone on the Rocinante and find themselves up against a Martian military blockade. Believing all is lost, Miller finds a new reason to forge ahead. Avasarala visits Holden's family in Montana.

The crew of the Rocinante discovers a derelict vessel holding a secret that may destroy humankind. Holden and crew are led to Eros, where they finally cross paths with Miller, only to make a horrifying discovery. On Earth, Avasarala receives devastating news.

Miller, Holden and his crew struggle to escape Eros, but they're trapped when the entire station is put on lockdown. On Earth, Avasarala comes to a stunning realization about the origin of the mystery ships.

Miller, Holden and his crew fight their way to the Rocinante to escape Eros. On Earth, Avasarala fears for the stability of Earth's government and her family's safety.

James Holden and the crew deal with the aftermath of their escape from Eros. Martian Marine Gunnery Sergeant Bobbie Draper and her platoon witness the growing tension between Earth and Mars.

With the help of Fred Johnson and the OPA, Miller, Holden and the crew stage a dangerous raid in search of information about the protomolecule. On Earth, Avasarala learns a truth about Fred Johnson.

Holden and Miller butt heads about how the raid was handled.

Miller devises a dangerous plan to eradicate what's left of the protomolecule on Eros.

The Rocinante chases an asteroid as it hurtles toward Earth.

Earth and Mars search for answers in the aftermath of the asteroid collision. A dangerous new threat emerges outside Jupiter, while one lie threatens to destroy the Rocinante crew.

Preparations for the Earth/Mars peace conference tighten the tension on Erringwright.

Naomi tracks down signs of the protomolecule; Fred Johnson's control over the OPA collapses.

Bobbie becomes a political pawn in the struggle between Earth and Mars.

Holden leads his crew through the war-torn station on Ganymede.

Bobbie makes a decision that changes her life forever.

A discovery pushes Naomi and Holden apart and sets the Roci crew against each other.

The Roci crew must fight to save the ship.

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.

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.

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

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

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.

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.

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.

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.

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.

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.

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.

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

With 1300 new worlds within reach, a new interplanetary "land rush" has begun. The UN charges the crew of the Rocinante to settle a land dispute on its new colony world "New Terra." Meanwhile, the OPA begins transitioning the Behemoth to become outpost and gatekeeper to humanity's new frontier.

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.

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.

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

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.

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.

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.

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.

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

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 tries to convince Fred Johnson to destroy the last sample of protomolecule. Naomi gets an important lead to her son. On Luna, Avasarala begins to hunt for Marco Inaros.

Holden and Fred deal with infiltrators on Tycho. Drummer's past comes back to haunt her. Amos returns to Baltimore. Alex and Bobbie's investigation on Mars leads to rogue soldiers.

Naomi comes face to face with Filip. Holden and Fred turn the tables. Avasarala closes in on Marco's plot.

Marco's grand plan shocks Earth, Mars and the Belt.

Amos and Clarissa are trapped in a collapsed building. Naomi contends with her old family. Holden assembles a new crew on the Roci. Alex and Bobbie make a dangerous discovery in the Belt.

Holden and the Roci go on the hunt. Amos and Clarissa seek shelter on a devastated Earth. Bobbie and Alex fight a desperate battle. Marco makes Drummer an offer she can't refuse. Avasarala returns to a position of power.

Naomi makes a desperate attempt to save her son from Marco. On the Roci, Holden battles for the last sample of protomolecule.

Amos returns to Baltimore with Clarissa. On Luna, Avasarala's creates division in the UN Council. Alone and adrift, Naomi becomes a deadly lure. Drummer feels the pressure growing on all sides. The Razorback receives an unexpected message. 

Amos, Clarissa, and a gang of thieves work together to leave Earth. Avasarala tries to head off a brutal military strike. Drummer's new family bonds are tested as Naomi's life hangs in the balance.

Holden and the Roci face off against Marco's forces and Drummer, while Alex and Bobbie attempt a dangerous rescue of Naomi, and the balance of power in the Solar System shifts.

The tensions of war threaten to pull the Rocinante crew apart when they make a startling discovery on an asteroid. Avasarala and Bobbie contend with the devastation on Earth as Marco's rocks continue to rain down. In the Belt and on the run, Drummer and her family must make a heartbreaking decision. On Ceres, Marco and Filip's struggles turn inward.

With an unexpected passenger aboard the Rocinante, Holden and crew undertake a dangerous mission that could shift the balance of power in the war. Drummer decides to make an uneasy alliance. Filip wrestles with his guilt.

Avasarala, with the Combined Fleet of Earth and Mars, takes the war to Marco. Filip and Marco's relationship is tested. The war becomes more perilous and personal for Holden and Naomi when the Rocinante is suddenly forced into a battle.

Holden finds himself at odds with his crew when a controversial decision is uncovered. On Ceres, Avasarala struggles to contain an escalating humanitarian crisis. Drummer's growing faction stage a daring raid with dire stakes. Filip, demoted to repair skiff duty, makes an unexpected discovery.

Paths converge on Ceres when Drummer and her fleet arrive to aid the relief effort. Holden tries to convince Avasarala to release crucial information that might avert catastrophe, but she has her own request of him. As Amos and Bobbie get a little R&R at the station, Naomi has a difficult and long-awaited reunion.

In the thrilling season finale, Inners and Belters fight side by side with the crew of the Rocinante in a last, massive, desperate battle with Marco and his Free Navy, with the fate of the Solar System, the Ring Gates, and of all humanity hanging in the balance.

Hosted by Adam Savage, this half-hour special features exclusive interviews with the series' cast, crew and creators, who share behind-the-scenes secrets and never-before-seen content from the first season.

Kevin Smith helps explain the action that has unfolded during the first three seasons.