Away

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

After a ship malfunction threatens the voyage, Emma works with Misha on a high-risk repair operation.

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

Ram endangers the lives of everyone on the Atlas, causing Emma to put herself in harms way; Matt must make a life-changing decision.

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

Tempers flare on the Atlas over a water-system glitch and an act of betrayal; Matt meets Lex's new friend while working on the ship's issues.