Two giant scientists perform cloning experiments on the Earthlings.
Steve is turned into a raving paranoid by exposure to mushroom spores, and cuts a deal with Inspector Kobick to betray his crewmates.
The Earthlings must play a giant-sized game of chess against a demented industrialist... who uses his prisoners as pieces on a board rigged with booby traps.
The Earthlings come to the aid of a giant deaf boy and his poverty-stricken family.
The Giants have invented a detector that can home in on a unique Earth-based metal. Dan puts the entire group at risk due to the surgical pin in his leg, and they mus turn to a former ally, Dr. Brule, for help in removing it.moreless
The Spindrift crew finds a paranoid survivor from Earth...but his suspicions endanger everyone.
The Spindrift crashes on the Land of the Giants and its crew and passengers quickly find themselves in a struggle for survival.
The Jupiter 2 lands on a planet which apparently serves space as a junkyard. The Robinson's food supply is dwindling, so Dr. Smith tries to sell the robot and the ship in order to get food.moreless
Doctor Smith uses the space pod to land on a planet that the Jupiter 2 is passing by. It turns out that on this planet, plants are the highest form of life and some of them are quite intelligent. One of these plants, a large carrot, captures Smith and tries to change him into a plant.moreless
Dr. Smith disposes of a plant that has grown out of control. However, the plant manages to attach itself to the Jupiter 2, apparently believing that Smith is its mother. Meanwhile, the ship comes under attack by a space warrior.moreless
The galactic showman, Farnum B, returns, this time as the producer of the Miss Galaxy Beauty Pageant. And he wants Judy to be in the contest, only she wants no part of it. Dr. Smith submits her anyway by forging her name to the contest roster.moreless
Don West and Dr. Smith are installing some equipment when Dr. Smith comes across an alien prison escapee. The prisoner alien makes Dr. Smith change jackets and then runs away. When the prison guards catch up with Smith and West, they arrest them for aiding the escape of a prisoner.moreless
Rocketing through space, the Robot suddenly announces that the Jupiter 2 is approaching Alpha Centauri. Everyone is surprised, and the ship lands on a planet, where they are greeted by a group of people who appear to be teenagers from Earth. It turns out that they are aliens who live like Earth-style hippies, and they are incapable of growing old.moreless
Will Robinson meets a man in a cave who may hold the solution to helping them get to Alpha Centauri.
A crew led by Captain Kraspo is searching for the missing Princess Alpha. They bring Will Robinson on board their ship, and he makes them think that Penny might be the Princess they are looking for.moreless
The space pod lands on a planet that is inhabited by creatures who all look alike but aspire to be different. They capture the Robinsons and make duplicates of them with the objective of using the duplicates to fly the Jupiter 2 back to Earth. Only Will is not duplicated and attempts to thwart their plan.moreless