Seven months later, marooned on a watery planet, the Robinsons make a risky bid to power up their Jupiter, and Will vows to track down the Robot.

Penny and Maureen become trapped in a mysterious metal trench, and Don falls prey to a nasty toxin.

The mission to save Scarecrow takes an unexpected turn, throwing the Resolute into chaos. Judy hatches a plan to get a ship to Alpha Centauri.