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.

While Dr. Smith moves ahead with his secret project, seismic activity wreaks havoc across the planet and leaves two teams facing impossible choices.

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.

The Robinsons make contact with another family of survivors, and Will races to protect his family after Judy learns what happened aboard the Resolute.