Dr. Smith, no longer permitted to live in the Robinson camp, takes refuge in the wreck of an alien spaceship. Here, he finds a machine that makes wishes come true. To convince the Robinsons to allow him back into the Jupiter 2, he gives the machine to them. But the machine allows greed to dominate their lives and the Robinsons demand that Smith get rid of it. He does not, but soon after the machine’s original owner, a strange creature, returns to retrieve it.
original airdate--November 24,1965
Trivia--This is the first of many times Smith is exiled from the Robinson camp.
- The miniature Jupiter 2 procured by the wishing machine is the 18" model used for space scenes throughout the show. It is also interesting that Dr. Smith chooses to manifest another Jupiter 2 as the result suggests the reason why the developers of the wish machine couldn't use it to repair their own ship.
- In this episode, we learn that apples are rare and precious commodities that the Robinsons do not have. However, in the episode “A Trip Through the Robot” we see Dr. Smith chomping on an apple like it is nothing special at all.
- The title is based on the Disney song 'When You Wish Upon a Star'.
Goofs-- Maureen turns the forcefield on before the men clear the area, yet they don't get jolted.
- When Dr. Smith finally asks for too much from the wishing machine, all the items wished for at the Jupiter 2 become defective but not the items at Smith's campsite in the derelict alien ship (nor the eaten food in anyone's stomach). Later, all items at Smith's campsite disappear along with the alien. (We never hear if the same happened to items at the Jupiter 2, which would have left Judy suddenly naked if, for some reason, she hadn't yet changed out of her ragged dress).