Judy sets out to find Maureen, while Will and Penny lead an expedition to the caves. Dr. Smith pursues a new escape plan.

Maureen finds a solution to the fuel issue, but putting her plan into action proves trickier than expected. Dr. Smith realises her cover is blown.

Maureen debates whether to share what she saw in the sky, Don leads a mission to find fuel, and the robot’s presence stokes tensions within the group.

As the team builds a tower to signal the Resolute, Maureen investigates a planetary anomaly, and Will braces for a tough conversation with his dad.

Sam and Castiel follow up on a lead about the Mark of Cain. Dean and Rowena meet.