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| - The Automated Planet (as the Robot refers to it), which the Robinsons left in the previous episode, has launched a hyper-atomic missile at the Jupiter 2. It is a homing missile and seemingly cannot be avoided, but John comes up with a plan to evade the missile and it crash into a nearby planet instead. The ship is damaged by the manoeuvre and must land on the planet as well. There are many weeks of repairs ahead., but no one can go outside because it is uncertain if the atmosphere is suitable for humans or not. John does not even want to send out the Robot as the fog at their landing site might prove corrosive. Smith does not care and sends the Robot out anyway. Robot is only outside a few moments before something happens to him and he breaks communication with the ship. John is furious and forces Smith out to find the Robot. Smith wanders around outside for a short while before he sees a giant bird and faints. John and Don look around themselves but cannot find either Smith or the Robot. John sends everyone to bed, but Will stays up in case Smith comes back. Will then sneaks outside to have a look around on his own. He is confronted by the same giant bird and an orange-haired man called Tiabo, who is not at all happy to see him. Tiabo is convinced Will is part of an invasion fleet and locks him up in a cave where Smith and the Robot are waiting. Tiabo warns that if anyone tries to leave the cave, the giant bird will eat them. He then scurries off to contact his superiors. Left in the cave, Will and the Robot worry and Smith drinks a strange liquid he has found. They overhear Tiabo’s transmissions, but Will thinks the messages are odd somehow. Tiabo mentions a secret weapon that he plans to use on the Jupiter 2, and Will decides they must escape to warn the rest of the family. On the way back, it is discovered that the beverage Smith has been drinking is a liquid explosive and that he is now a walking bomb. Once back with the others, Smith must stay far away from everyone else in case he blows up. Will takes pity on Dr. Smith and agrees to go back to Tiabo to beg for an antidote. Will finds Tiabo, and manages to convince him that they need not be enemies. Tiabo gives Will some pills that will neutralize the explosive and moves away to the other side of the planet. Meanwhile, Robot decides to use a detonator to blow up Dr. Smith. Fortunately, Will arrives in time to stop him and administers the antidote.
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