If you loved The Adventures of Mark Twain, try He-Man and She-Ra: The Secret of the Sword
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

The Adventures of Mark Twain
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He-Man and She-Ra: The Secret of the Sword
What they share
Theyboth carry the atmospheric, cozy mood tags, and they sit in Adventure / Animation / Family / Fantasy territory. If that's the register that drew you to The Adventures of Mark Twain, the second film will land in a comparable space — through a different lens.
atmosphericcozy
What He-Man and She-Ra: The Secret of the Sword is
So, Filmation decided to gin up a new toy line. Prince Adam is tasked with hopping over to Etheria and handing a magic sword to his twin sister, who is leading a rebellion. It did result in a bunch more cartoons, so, success?