Farnam (Leonard Stone), a conniving interstellar zoo-keeper, kidnaps the Robinsons (except an inexplicably absent John) with the intent of making them the main attractions in his cut-rate menagerie but when he (and Will) are inadvertently transported to a primitive world, the ever-mercenary Smith takes over as showman, much to Judy's disappointment and Major West's rage. This episode is a weak re-visiting of the season 2 two-parter 'The Keeper' with Michael Rennie as a celestial zoo-keeper. Stone is amusing as this week's 'eccentric' guest but Gary Tigerman is ridiculous as cave-boy Oggo (he looks like a clean-cut '60s teenager costumed as Fred Flintstone for Halloween). The budgetary (and creative) limitations that were becoming overwhelming in the third season continue to be on display: Irwin Allen recycles footage of a lizard dressed as a dinosaur (from his unnecessary and uninspired 1960 remake of 'The Lost World') that doesn't match the prop dragon-head that threatens Will and Farnam. The zoo-keeper is supposedly able to travel through space and time to gather specimens yet his 'zoo' seems to contain nothing other than the captive humans (at least we got a glimpse of the Keeper's vast complex of cages and some of his menagerie). By now, Smith (who essentially plans to enslave Don and Judy as exhibits for his own enrichment) was one of the show's money-makers (along with Will and the Robot), so you know that no matter what he does, the story will wind up as a 'forgive and forget', but it still beggars the imagination that Don, John, or Maureen hasn't stuffed him out the airlock by now.