The Robinsons discover first a frozen princess, then an extortionist who plans on kidnapping her to hold for ransom. The episode starts reasonably well (albeit highly derivative of 1951's 'The Thing') and Corinna Tsopei is quite appealing as the silent, frightened princess but then falls off a cliff into vapid silliness as the villainous Chavos (Alberto Monte), a chrome-plated Frito Bandito complete with crossed bandoleers and a silver sombrero, shows up. By now, the show was essentially fluff for the kids, primarily focussing on the 'comic' antics of Smith and The Robot (with Will as straight man) and this episode features the Robot getting drunk (apparently by having tequila poured into his housing) and later suffering from a hangover (and treating it with the classic 'ice bag on the head' routine). Apparently, the character of Chavos was such an offensively over-the-top Mexican stereotype that the episode, which was broadcast around the same time as the vocal criticism of the aforementioned Bandito was heating up, was yanked in some parts of California. The trajectory of this series over three years, from a reasonably adult sci-fi drama to a juvenile 'camp' comedy, may be unique. I loved the show as a kid but it's a bit hard to watch now (especially if I take of the nostalgia glasses). Judy and Will's duet of the folk classic 'Sloop John B' is a highlight (and boosts the castle-less 'Castles in Space' 1 rating point).