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
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
Dr. Smith and Penny are entrusted with a valuable amulet after saving an alien's life. However, trouble soon arrives in the form of space thugs, and they want the amulet.
The Robinsons' power source drops to critical levels, leaving them unable to recharge the Robot. Rather than endanger them, the Robot leaves the group. The crew looks for it and Will and Dr. Smith discover that the Robot has grown to be bigger than a house after exposure to strange gasses.moreless
The Robinson family and Major West are imprisoned in their camp after being indicted to appear before a court for space crimes. As the trial begins, Dr. Smith's name begins to appear and it is not long before everyone realizes that all of the Robinson's "crimes" should be attributed to Smith, and he is indicted to appear before the court.moreless
John Robinson becomes possessed by an alien creature who forces the family to prepare to return to the creature's home world, even if it requires that he sacrifice Will to keep his secret from the rest of the family.moreless
Penny is given a gift by a thief on the run, who tells her to protect it for him. She and Dr. Smith discover that it leads them to a ring which, when worn, allows the person to turn anything to platinum, which Dr. Smith does. Unfortunately, the ring also turns their food into the metal too and food is always in short supply.moreless
An alien boy is sent to Priplanis to validate his prince status. Will Robinson is drawn into a battle to the death, unbeknown to his father. Once his real intentions are known, John Robinson substitutes himself in the challenge and the alien ruler substitutes himself for his son.moreless
Will Robinson and Dr. Smith stumble upon another robot on the planet that is even more capable than their own. The alien robot sets out to gain the confidence of the Robinson family because, at a future critical point, he plans to transport them to his home planet as slaves.moreless
The Robinsons are given the option to turn Penny and Will over to The Keeper or face certain death.
A zoo keeper who travels the universe wants to take Will and Penny and add them to his vast collection of celestial animals.
The Robinson family banishes Smith from the Jupiter 2. He takes refuge in an abandoned spaceship where he finds a machine that can materialize anything. In an attempt to get back into the Robinson's good standing, he gives them the machine, which plays on the family's greed.moreless
A visiting family of aliens, called Taurons, have decided to use the Robinsons' planet as a new colony. Although the Robinsons cannot understand the language of a visiting family they welcome them to live in peace and harmony. However, as usual, Dr. Smith causes problems when he panics and draws a gun on the alien family.moreless