No matter my opinion and even after all these years I still think the Jupiter II is very cool. It seems such a pity they designed a cool ship and then after the pilot (worked into the first few episodes) we never saw it fly again until the third season, which by then the show was in colour and so ridiculous it was practically unwatchable.
Yes, I also have a soft spot for the Jupiter II.
I wonder if--as they must have thought--Dr Smith was actually helping the show?
What if he had been gotten rid of---could the level of seriousness been brought to a level between the mostly serious of TOS and the 'completely ridiculous' that it devolved into?
Could the show have had youth appeal and
gotten adult or serious sci-fi fans to say...
"That was a bit of sci-fi fun." as opposed to
"what a bunch of kiddie-crap."