Tensions on Earth and Mars come to a head.

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

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

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

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

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

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

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

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

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