The Expanse Episode 1.09 Critical Mass

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.

The events leading up to Julie Mao's infection by the unknown biohazard on the Anubis and gruesome death in her hotel room on Eros are revealed in a flashback. Fred Johnson broadcasts evidence that the stealth ships were built on Earth. After Miller and the Rocinante crew flee the hotel, Julie's body is found and studied by Dresden, a scientist working for Julie's father Jules-Pierre Mao, who harvests her infected blood. Under the guise of a ship explosion and radiation leak, mercenaries loyal to Julie's father and Dresden place Eros into lockdown and seal the poverty stricken citizens into radiation shelters after infecting them with Julie's blood.

As the Rocinante crew and Miller try to reach their ship, Miller and Holden discover the shelters' true purpose as growth accelerators for the infection and receive a lethal dose of radiation.