A space colony family struggles to survive when a spy/accidental stowaway throws their ship hopelessly off course.
Will and the robot try to rescue the kidnapped Prof. Robinson in a macabre world of orange grass, polka-dotted leaves, and animated rocks.
John falls into a cave containing a centuries-old mummy, whose spirit possesses John’s body.
Will finds a rusted, more capable robot, but the Robinsons’ own robot warns him against rebuilding the device.
The Robinsons encounter a militant boy who is determined to prove his superiority over the earthlings.
Will and Dr. Smith discover a device that transforms wishes into realities.
Penny discovers an extraordinary mirror which reflects a world that does not exist.
The castaways’ planet is visited by a being traveling the universe to collect creatures—two of every kind.
The Robinson women and Dr Smith become involved in a war between the leaders of two alien civilizations.
Will disobeys John’s orders to stay away from the matter-transfer unit and is transported back to Earth.
Penny discovers a deep cave inhabited by an invisible but seemingly friendly voice.
The travelers are menaced by glowing creatures who are looking for a humanoid brain.
The Robinsons encounter a family of crablike visitors who are far from friendly.
The Robinsons must turn Penny and Will over or face death.
The Robinsons meet a space traveling Earth man, Alonzo P. Tucker, who was abducted by aliens in 1876.
The Robinsons face dangers on strange terrain, where water is running low and the heat is getting more intense.
An earthquake threatens to seal the cave where Don, Judy, Will, and Penny are trapped.
Smith sets off an explosion in a bog, arousing an invisible, indestructible, and irresistible, creature.
A blue mist causes the travelers to disappear one by one until only Will is left.
Will tries to brew dissension among shapeless aliens who plan to conquer Earth.
Dr Smith and Will befriend an old miner named Nerim. After a series of earthquakes indicates that the planet is breaking up, Dr Smith tries to convince them that it is merely the effects of mining, and no harm will come to the planet. John informs him that he is wrong and that the Robinson family will be departing within the day. It is a race against time to escape the crumbling planet.
Dr. Smith and the women discover that their spaceship has been looted.
Penny shelters an interplanetary fugitive who gives her a small disc that is supposedly the key to the greatest treasure in the galaxy.
Visitors from Andronica are looking for a king – a position Dr. Smith feels uniquely qualified to fill.
The robot is being used to help create a sinister army of machines.
The Robinsons must contend with a rapidly growing plant and missiles fired by aliens.
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