Sounds about right!
I can’t say I have come across Earl Sump yet.
“The Would-Be Defender”. He’s possibly the most annoying character ever created!
I watched the Hall of Wisdom last night. I remember on my tape it cut off just as it showed Mandrake Lothar and Kshin on the asteroid after abandoning the ship. I remember it was on the tape I had Bits n Chips, Root of Evil. It was one of my favourite video tapes as I had Thundercats Berbils and Turmagar the Tuska on it, a Ewok episode of the Tottem Master, Chip n Dale and Gummi Bears and a few other cartoons. In fact I am 100% sure I still have that tape in the small collection of VHS tapes I kept.
I still have quite a few tapes myself, although nothing from my youth.
As for Hall Of Wisdom - yes, good episode, and one of those that continuity points forced into an earlier position than I would have otherwise put it. It’s episode 4 on my continuity list, it does not have the feel of an early episode, and ordinarily there’s no way I would have put it before “The Revenge Of Astra” or “A Demon In His Pocket”. BUT, it makes a big point of introducing Ming’s Molecular Disruptor Beam, which is also used in “The Mind Warriors”, which has a significant continuity point in that it’s the best reveal for the location of Ice Station Earth. So “Hall Of Wisdom” has to come before it.