Holden and crew find themselves in the middle of a desperate battle while still aboard the Martian battleship. Miller’s partner, Havelock, goes missing.

Holden finds an unlikely ally. Miller’s obsession with Mao intensifies.

Miller gains valuable information from a hidden data cube. Holden and his crew learn their host’s agenda.

A derelict vessel holds a potentially devastating secret. Holden and his crew cross paths with Miller on Eros. Avasarala receives bad news.

Julie's origin story ends up revealing her trajectory. Holden and Miller work together as they take a look at a strange emergency happening on Eros.

With the help of Fred Johnson and the OPA, Miller, Holden and the crew stage a raid for information on 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 towards Earth.

Earth and Mars search for answers in the aftermath of the asteroid collision.

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.

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

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.

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 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.