Granted some of these last episodes deviates from the mainstream traditional science fiction (very opposite of first season e,g. their lift off from Alpha ctrl from Earth and invaders from 5th dimension was the epitome of science fiction-gloomy, black and white, music background everything in place), but the newer episodes lost some of that tradional sci-fi steam. However, I still find the later episodes amusing because of the family love, cohesion, simple laughter in the Robinsons. Seeing them how they carried out the lines and drama, always gave me peace and warmth that reminds me of home. They were simply a good family-real people (not far fetched) with decent values. So in all fairness, though it may have decreased with sci-fi atmosphere, the fun, loving respect among them especially John Robinson to hold the family together and good leader concluded the entire program with satisfaction. Irwen Allen was brilliant because he must of thought of something beyond any science fiction writer, when he had just a simple family pose as the main characters, instead of wierd looking aliens (half human with long ears, scaly skin, etc like Star Trek), because I can still view full blown science fiction if all the characters aren't alien-appearance like.

Wasn't the best of LIS but not bad. I had to wait for it !! What I'm saying you are right about Judys act down there. But did you not see the little foot shuffle? just a little kicking back and forth, with out that I would have said a 3 star at most. LIS good to the last ! night. The robot laws on this one was by guess or by golly I thought !

... and Judy almost becomes a victim of tentacle rape.At first I thought that this one was going to be too silly and campy to endure, but there were some interesting elements that somewhat redeemed it: the idea of pocket-dimension prison, with musical tones being the key that gives access. I do agree with the previous poster that Judy's behavior in "Hades" was too much; irritating to the viewer, untrue to the character, and humiliating, I'm sure, to the actress. Don's almost as ridiculous, and that bit of slapstick on the turntable toward the end was clumsy.
Hmmm...maybe it wasn't all that "OK" after all.

Judy, Don, and Dr. Smith wind up in Hell at the mercy of a fake devil trapped in a prison by a harp. Complicated, thin story is very amusing and Mohr as Morbus is perfectly sly and witty as the devil. Judy cries, cries, and gives a poor performance but still a good episode with colorful sets and yes, another silly creature to frighten Dr. Smith.

If you watch the shows and seasons after this one you will see that Devil costume pop up again and again, and again.......This show was supposedly canceled because of it's expensive budget (for those times anyway) But seeing how they always recycled costumes and sets that doesn't make much sense.