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
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
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
The Robinsons come across a group of space hippies who are trying to destroy the planet the Robinsons currently inhabit. It is up to the Robinsons and Dr. Smith to stop them or they will all be doomed.moreless
The Robinsons' communications system is knocked out, and they discover that the culprit is a female warrior, who is planing on making their planet a colony for her people.
Due to Dr. Smith's actions, the crew of the Jupiter II has had to land their ship on a alien planet which is run by cyborgs. The crew must rescue their crippled robot and then try to break free from the captors, even though the cyborgs promise them power and luxury for the rest of their lifes.moreless
The Intergalactic Delivery Service comes to Priplanus. Once again Dr. Smith seeks transportation and has Will "test drive" the spaceship. Will returns much smarter than when he left. Smith, realizing the same increase of intellect could happen to him, boards the spaceship. His trip, however, ends in his rapid aging and subsequent impending death.moreless
Dr. Smith holds a seance to contact his Uncle Thaddeus. Instead a "spirit" creature is contacted and creates havoc for the Robinsons.
Jarrod is happy to see an old law school friend...until he learns there is a secret service agent on his tail. It seems everywhere Skyler goes counterfeit money follows, and Jarrod is determined to find out what's going on with his old friend.moreless
Will uses an alien transporter to send himself back to Earth. However, many people believe the Robinson family to be dead after hearing the ship went off course. Nobody on Earth believes him, and they lock him up with the intention of sending him to a boys' home.moreless
Dr. Smith eats some alien fruit, which turns him into a giant. He becomes convinced that giving him the fruit was the Robinsons trying to kill him. So he plots to take them out.moreless
Astronaut Jimmy Hapgood lands on the planet and the Robinsons befriend him. After Jimmy fixes his spaceship, the Robinsons try and convince him to take Will and Penny back to Earth with him. However, Dr. Smith tries to get aboard the ship to get back to Earth instead.moreless
The Jupiter 2 is pulled into a giant alien spaceship where there are advanced rock-like creatures. John and Don look for maps and equipment while Dr. Smith and Will look for trouble.