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A space colony family struggles to survive when a spy/accidental stowaway throws their ship hopelessly off course.

A strange interdimensional ship turns Will into a genius and Dr. Smith into an old man.

Intergalactic showman Farnum B captures humans to exploit for the amusement of aliens. Among the new exhibits in his star-spanning zoo are Will, Penny, Don, Judy, Dr. Smith, and Robot.

An alien harp's found, which opens a gateway to a planet which is - or isn't - hell.

Dr. Smith and Penny obtain a ring that will turn anything to platinum.

A space miner is blasting the planet apart and the Robinsons have to leave even though Smith wants to stay and become rich.

Will meets a princess who is escaping two bounty hunters, yet Will gets kidnapped instead.

A group of space hippies is going to destroy the planet the Robinsons are on.

The Robinsons leave their planet to escape a collision with a comet and find a ship full of frozen convicts.

Smith's cousin, Jeremiah shows up, which can't be for a good reason..

The Robot "falls in love" with an evil female robot sought by two aliens.

Accidentally landing on a planet, Will, Doctor Smith and the Robot find the Jupiter 2 is now an archaeological site and that they are in the future.

An evil spirit possesses John Robinson and plans to fly the Jupiter 2 back to his home world, even at the expense of Will's life.

Don and Doctor Smith are sent to an intergalactic prison after coming across an escapee.

Trying to contact his Uncle Thaddeus during a séance, Doctor Smith summons a ghostly monster native to the planet.

Doctor Smith delights that he is made ruler of an alien species until he learns that he is also their sacrifice.

After killing a hostile alien, Professor Robinson comes across a "hunter" and he must replace his dead prey.

Macabre aliens -- quite literally talking heads -- need a humanoid brain to replace a worn out computer in their spaceship. They capture Smith, but quickly realize that his brain is unsatisfactory. The aliens release Smith so that he can bring them somebody more suitable: "a small Robinson."

With the Robinsons running out of food, Dr. Smith trades the ship and the Robot to a junk man for food.

A spaceship requests medical help for their computer and Dr. Smith has to perform brain surgery on it.

A space pirate looking for his crew that mutinied finds Will and Dr. Smith trying to repair his empty ship.

Penny strikes up a friendship with a deep voice in a deep cave.

Penny is kidnapped by aliens who think that she is the missing Princess Alpha.

Using a matter transfer device left behind by the Taurons, Will beams himself back to Earth. He arrives safely in the small town of Hatfield Four Corners, Vermont, but his pleas for help are considered the fantasies of a runaway boy.

In the second of two sequels to The Android Machine (1966), Verda's sheltered by the Robinsons after she's marked for destruction by the Celestial Department Store. To that end, the store dispatches a killer android: IDAK (Instant Destroyer And Killer).