As the mission launches, Emma finds her mettle as commander tested by an onboard accident, a divided crew and a family emergency back on Earth.

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When a ship malfunction threatens the voyage before it's barely begun, Emma works with a wary Misha on a high-risk repair operation.

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A staff change at Mission Control upsets the usually unflappable Lu, and the fallout undermines Emma's command. Matt encourages Lex to return to school.

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Emma puts herself in harm's way when Ram unwittingly endangers the lives of everyone on the Atlas. Matt must make a wrenching decision about his future.

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As Christmas approaches, the crew prepares to make their final calls home before communication grows spotty. Matt and Lex adjust to their new normal.

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Tempers flare on the Atlas over a water-system glitch and an act of betrayal. As Matt works on the ship's issue, he accidentally meets Lex's new friend.

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Emma's behavior becomes a cause for concern, Kwesi and Lu team up on a plant mystery, and Lex makes an impulsive decision with far-reaching consequences.

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A problem with Atlas' supply ship jeopardizes the mission and sparks questions about Emma's commitment to landing on Mars.

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Emotions run high as rapidly dwindling water rations on the Atlas leave the crew and Mission Control scrambling to find a fix before time runs out.

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With only hours to go before Atlas' planned touchdown on Mars, Emma is confronted with everything that could go wrong, while Lu receives new orders.

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