A disaster on board the International Space Station becomes a fight for survival.

Jo races to find a way back to Earth before her life support runs out. Henry is concerned about his experiment.

The space agencies begin their investigation into the ISS collision. Jo struggles to reconnect with Magnus and Alice.

Jo's life back home is not how she remembers it, and growing tension with Magnus adds to her feelings of alienation.

While on the run with Alice, Jo makes a chilling discovery. Bud threatens to exact his revenge on Henry.

Magnus worries that Alice is living in a fantasy world.

Lost and alone in the woods, Jo desperately tries to reunite with her daughter.

Jo is taken to an astronaut rehabilitation clinic, where the truth is revealed.