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

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

The astronauts move quickly to build Martian bases.

A joint mission brings about conflict between crew members.

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.

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

An accident on Mars strains relationships, while Miles embarks on a risky venture.

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

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

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

Tensions on Earth and Mars come to a head.