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.
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.
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.
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.