Episode list

The Keeper is an alien who travels the galaxy collecting living pairs of interesting or rare animals. His courtly overtures towards the Robinsons belie his true intention -- to add a pair of humans to his incredible menagerie.

Troubles with The Keeper would be over if Dr. Smith hadn't skulked aboard his ship and released all the animals, putting The Keeper in a position to blackmail the Robinsons for their children.

Will becomes fast friends with Captain Alonzo P. Tucker, an Earthling who escaped his alien captors to become a wandering space buccaneer. But Tucker's roguish charm hides a secret that could destroy them all.

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

After the Robinsons repair a damaged robot, it first helps them and then plots to capture them.

Penny stumbles into an alien mirror and finds a universe occupied by one very lonely boy.

John and Will fight a battle with an alien father and son that is to the death.

After ruining the Robinson's food supply, Doctor Smith makes a deal with the space trader and gives his body for food provided he collects it in 200 years. The space trader comes to collect immediately.

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

The Robinsons run into a group of space hillbillies whom Zachary believes might take him back to Earth.

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

Will awakes a sleeping princess whom he now must marry. Her race has been awakened and now plans to conquer the universe starting with Earth.

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

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.

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

Smith finds the course back to earth, but a space female lures Smith out of the ship. Saving him would again leave the crew of the Jupiter 2 lost in space.

Smith makes the Jupiter 2 land on a planet occupied by cyborgs.

The Robinsons encounter a hermit who plans to attack the Jupiter 2.

A space circus comes to town and the owner wants Will to run away with it.

The Intergalactic Space Tribunal put the Robinsons on trial for various crimes

Dr Smith orders an android who they teach to be more human. A salesman shows up looking for payment

! Smith offers to help space gladiators, who travel through space. They agree to take him to Earth - if he wins a fight, but If he loses, he - and Earth'll be destroyed

Will, Penny and Dr Smith get involved with a thief who's on a quest to find a princess.

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

A wanted intergalactic gunfighter (and Smith's doppelganger) switches places with him.

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

The robot's stolen to create more robots so they can conquer Earth.

Doctor Smith trades the Robinsons' emotions - in exchange for a trip home.

Penny's caught in the middle of a war between the leaders of 2 aliens species. One's named Keema, the 'golden man'. The other's an ugly, toad-like alien