This is the kind of episode that only a true Lost in Space fan will appreciate. The story is pretty silly, but it can also be a lot of fun. There are two liabilities here. Guest star Robert Foulk and Angela Cartwright, herself. As Captain Kraspo, Foulk looked a mess. His loud, abrasive performance didn't help. Angela overacts here, in more ways than can be counted. At the start of the episode, Penny is looking at what appears to be a magic carpet. She hears a voice say: "Do you want to be a princess, or not?" She then screams and runs away. Why should this have made her scream? She had already seen (as opposed to only hearing) worse things than this. Also, why was Penny chosen as the princess? Why not Judy? Penny was pretty, but Judy was beautiful. In any case, this is a campy, silly, but enjoyable episode. I'm pretty sure this was the only episode that had three official guest stars (Foulk, Arte Johnson and Sheila Mathews).