When his cousin Jeremiah Smith (Henry Jones) appears on the planet, Dr. Smith goes into hiding, knowing that he and Jeremiah are the heirs to the Smith fortune, bequeathed to last surviving member of the family. By now the show makes no attempt at credibility - how Cousin Smith knows where Dr. Smith is (the doctor is "lost in space" after all), how Cousin Smith came to be aboard a spaceship, where Cousin Smith goes after the closing credits of this episode (maybe he joins the dog from 'One of our Dogs is Missing (S1, e.13) and Judy the Bloop in some LiS limbo) are all unexplained. The episode is played for camp laughs, with the ever-avaricious Smith getting conned by some kind of colourful space-casino game and the robot given lines like 'feets do yo' stuff' when an exploding pie is about to detonate. To the ever-growing list of improbable stuff loaded into the Jupitar 2's hold prior to initial takeoff, add a mining cart and the tracks to run it on. Even by second season standards, this is a weak, sloppy-written episode.