After Will averts the Robot's murderous intent, the Robinson party comes under threat by native creatures at extreme size ranges. Parasitic microbes in the soil await catalysts to infest and grow into monstrous proportions while a giant cyclops roams the area. Adding to that, the weather takes an extreme turn for the worse, forcing them to abandon ship. A cave containing the remains of a civilized people provides temporary sanctuary but also a danger for the curious. Written by
Did You Know?
While having Smith and the Robot stay behind is way of emphasizing Smith's attitude of not helping the Robinsons, it was actually done for a more practical reason. The first several episodes of the show reused various parts of the original unaired pilot which did not have Smith and the Robot as part of the crew. By leaving them back at the spaceship they could save a lot of money not having to film new sequences and just reuse the old footage. See more
When checking the Robot's circuits, Will plays chess with it, and uses the move "Queen's bishop to King's Knight Four". That move is impossible, as King's Knight Four is the opposite color as that on which the Queen's bishop moves. The Robot later said "Does not compute" to at least one other move, but not to this one. See more
When Dad calls me William in THAT tone of voice, it's no use arguing.
Traditional folk song
Performed by Bill Mumy See more