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Fritz Feld ("Pop!") makes a return appearance as Zumdish, formerly the head of the Celestial Department Store, and now in charge of an intergalactic tour agency. Zumdish's arrival on the planet prompts Dr. Smith (Jonathan Harris) to try to turn over a quick profit by transforming the Jupiter 2 into a vacation resort--"The Happy Acres Motel"--in the Robinsons' absence. Unfortunately for Smith, his first "tourists" turn out to be a vicious band of homicidal bank robbers! That's Edy Williams, pneumatic star of many a Russ Meyer skin flick and latterly a ubiquitous undressed presence on Oscar Night, in the role of sexy gun moll NON.