Tensions on Earth and Mars come to a head.

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

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

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

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

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

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.

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

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