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 Robinsons' dreams of a happy reunion fade when they realize something's very wrong aboard the Resolute. Smith seizes a chance to clear her name.

While Will searches for clues to the Robot's fate, John and Judy travel to the dusty surface of the nearby planet to help their fellow survivors.

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.

While Judy sets out to find Grant Kelly, Penny and Will explore a mysterious tunnel. Light years away, Maureen, John and Don hunt for SAR's remains.

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.

After crashing on a boggy planet, Maureen and Judy contend with a massive salivating creature, while John and Penny work to free the trapped Robot.

The story of Don's run-in with SAR leads the Robinsons to an alarming realization. Will sneaks out on a dangerous solo mission.

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.