At the end of the last season, the protomolecule virus has taken over Eros and threatened the safety of the entire solar system. At this moment, a larger conspiracy to control the protomolecule virus is further revealed. At the same time, UN Deputy Secretary-General Avasarala and Martian soldier Bobbie Draper are trying to tell the truth and prevent a war between Earth and Mars. And Johnson, the leader of Tycho Space Station, wants to take this opportunity to be on an equal footing with Earth and Mars. But... the mysterious creatures have gotten out of control...