The Jupitar 2 is forced to land on a planet that turns out to be a gigantic junkyard run by a robot who is continually trying to improve himself by using parts scavenged from discarded machinery. The central premise is interesting and the images of the debris-strewn planet that is constantly bombarded by junk tossed down from orbit are reasonably entertaining, but the plot, which finds Smith swapping parts of the Robinson's faithful robot for food only to realise that the Junkman is not to be trusted is pretty weak (and derivative of season one's 'The Space Trader'). The anthropomorphising of the bubble-headed B9 is now complete and his Tinman epiphany is pretty maudlin. As a kid, I was probably bummed to find the series had been axed just as it's revealed that the Jupitar 2 actually has offensive weaponry. Apparently, the episode was filmed before the cancellation of the series was announced, so the fates of the Space Family Robinson, the redoubtable Major West, the scurrilous Smith, and the loyal robot remain unknown (too bad Irwin Allen didn't push for a 'TV-special' conclude the tale). On a personal note, this finishes my rewatching of the venerable series on MeTV, start to finish, in order, and weekly, just as I did back in the 1960s (although then I had to endure summer re-runs).