História alternativa: NASA em crise porque soviético chega primeiro à Lua em 1969.

Diretor von Braun opõe-se à diretiva do Presidente Nixon, com graves consequências.

Um acidente nos treinos leva a um debate nacional acerca das mulheres astronautas.

Ed e equipa mudam o local de alunagem da Apollo 15 após ser detetado gelo na Lua.

Acidente na plataforma de lançamento causa atrasos e leva a investigação do FBI.

NASA prepara missão de apoio a Jamestown e Karen espera notícias no hospital.

Uma crise no espaço põe as tripulações da Apollo 24 e 25 em perigo.

Ed lida com um invasor. Ellen e Deke traçam uma nova rota sem o Controlo da Missão.

Nearly a decade later, technology and lunar exploration have taken huge strides—but a solar storm threatens the astronauts on Jamestown.

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.

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

The rivalry between American astronauts and Soviet cosmonauts intensifies as last-minute changes impact the Pathfinder mission plan.

Tensions between the U.S. and the Soviet Union reach an all-time high on the moon, throwing multiple missions into jeopardy. Season finale.

Nearly 10 years have passed. Danielle and Ed attend a celebration, where things take a terrifying turn.

A commercial spaceflight company makes an announcement. The choice over who’ll command the Mars mission leads to a shift in personnel.

As NASA scrambles to prepare for the launch to Mars, Margo is confronted with a harsh personal reality.

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

The race to land first on Mars brings together unexpected allies.

After a sudden crisis, the Martian crews pull together.

Plans to leave Mars are complicated by an unforeseen issue.

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

Miles tries to make ends meet. Margo finds herself pulled into a dangerous situation.