The Expanse - Season 2 (2017)

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

The asteroid Eros takes direct collision course towards Earth. The Rocinante chases it. As last defense Earth launches missiles against Eros. Miller went inside Eros and makes a surprising discovery.

Earth is planning an expedition to the point of Eros impact. Chrisjen conflicts with Sadavir about Jules-Pierre Mao. Col. Frederick Lucius Johnson improves his position in unexpected way. New battleground is opening.

Draper struggles with what happened on Ganymede while the coming Earth/Mars peace conference tighten the tension on Errinwright. Dawes confronts Fred Johnson about what the OPA's course of action should be regarding the protomolecule.

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

Bobbie becomes a pawn in a 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.

In the final episode of this season, the crew of the Rocinante comes face to face with an evolving intelligence infused with the alien protomatter.