A joint mission brings about conflict between crew members.

The Martian crew debates how to save the life of one of their own.

A surprise maneuver during the journey to Mars provokes desperate measures.

Gordo returns to space. Molly faces an upsetting new reality. Aleida confronts her first major hurdle at work.

Ed’s reckless behavior at NASA shakes the foundation of the Baldwin family. Tracy attempts to readapt to life in space.

American astronauts and NASA leadership prepare for a new mission with unlikely partners. Ellen gets in touch with an old friend.

Ellen is challenged by her new role. Margo’s allegiances are put to the test. Karen explores new opportunities—personally and professionally.

Jamie tries to protect Callie—but is that what she wants? Mariana gets to the bottom of who wrote the anti-woman manifesto at work and is surprised by the answer. Malika…

The Station 19 crew trade in their turnouts for tuxes and gowns as they attend the Firefighters Ball, but when disaster strikes, they jump into action to save the day.