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

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.

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.

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

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.

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

John's predicament goes from bad to worse, sending Judy on a frantic race across the planet. Penny spies on Smith -- with help from an old friend.

The fast-spreading contaminant leaves Penny, Smith and friends stranded in tight quarters. Will and Maureen set out with Adler to find the Robot.

John recruits an unlikely partner to help hunt down a secret audio signal intercepted by the ship. Will begins to suspect Adler is hiding something.

While Maureen leads a mutiny, Hastings visits John to deliver an ultimatum, and Penny tries to convince Will that his Robot has changed.

Will and Penny scramble to hide the robots and figure out their next move. Meanwhile, Hastings amps up his war against the Robinsons.

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.

A year into their mission with the children of the Resolute, Judy, Penny and Will scramble to find the titanium they need to get to Alpha Centauri.

Scarecrow helps Maureen and John plot an engine heist. Judy returns to camp with new passengers. Will makes a startling discovery in the alien city.

As the adults race to destroy all clues to the location of Alpha Centauri, the Robinson kids receive an ominous message from SAR.

The Robinsons race to get help for Will, warn the other colonists and activate a secret defense system. Vijay tags along with Penny on a risky outing.

As the battle for Alpha Centauri unfolds, the Robinsons and their friends risk everything to restore peace and pave the way for a better future.