Tensions on Earth and Mars come to a head.

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

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

Things start to go awry just as an important mission approaches a critical juncture.

Ed and the crew change Apollo 15's landing site after lunar ice is detected.

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.

A crisis in space puts the Apollo 24 and 25 crews in peril.

Ed handles a trespasser. Ellen and Deke chart a new course without Mission Control.

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

A group on Mars takes drastic measures. Margo grapples with a new assignment.

Deke must recruit female astronauts after Russia lands a woman on the moon.

A dispute on the moon prompts NASA officials to consider arming astronauts. Ed’s past comes back to haunt him.

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

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

Ed, Gordo, and Danielle struggle with an extended Jamestown mission.

NASA preps a Jamestown relief mission, while Karen waits for news at the hospital.

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

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

Eight years later, a new mission begins: Capture an asteroid. Aleida and Danielle are still haunted by events from the past.

Unlikely partnerships are formed at a high-stakes international conference.

Director von Braun opposes President Nixon's directive, with dire consequences.

Plans to leave Mars are complicated by an unforeseen issue.

A discovery sends teams across Earth and Mars scrambling for answers.

Plans are made with interplanetary ramifications. Ed begins working with an unexpected partner.