S4E9 · Saeculum

Complete story — includes the ending

Murtry has the Israel launch a weaponized shuttle at the Rocinante. Alex destroys the shuttle, but the resultant debris damages many of the Rocinante's thrusters; Lucia is knocked into space but is saved by Naomi. Alex uses the ship's railgun as a makeshift thruster to maintain orbit. Miller, who can now intermittently overcome his protomolecule programming, leads Holden to an artifact that can shut down all of protomolecule activity on Ilus; this artifact, having the form of an energy circle, was presumably left by the species that killed the protomolecule's creators. Murtry and Wei follow Holden, but they are in turn followed by Amos and Okoye. Wei confronts Amos; when neither stands down, Amos kills Wei while Murtry shoots and disables Amos, blowing his fingers off. Okoye finds Holden near the artifact and tells him what happened. Holden goes back for Amos and confronts Murtry; after a standoff, Holden manages to disarm Murtry, though both are wounded. Miller communicates with Okoye and creates a metal mechanical body for himself to go through the energy circle. Despite the structure's attacks on them, Okoye helps Miller reach the artifact, through which they both fall.