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.

New Helios employees arrive on Mars as NASA undergoes major changes.

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

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

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

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

Tensions on Earth and Mars come to a head.