I honestly don't believe it was stolen, so much as a VERY bad coincidence. There are 2 Dennis the Menace characters, both came out at the same time...For me, it's The Lion King. It's one of movies I never liked as a child, never got me. I don't understand when everyone starts to compare new animation movies with TLK like it's a God. Many things were stolen from Kimba the White Lion, I do believe in this. Here the comparison goes -- http://www.kimbawlion.com/rant2.htm
I don't say that I hate TLK or anything like that. I like it, but all my fondness decreased to nothing because of its intolerable level of overrated-ness of fellow movies appreciators.
We know the US version:
But how many of us know about the UK version that came out exactly the same time?
The sad thing about Jungle Emperor Leo is... his American name was this close TO being Simba because someone in the US owned the copyright to the obvious name Leo the Lion (how many Leo the Lions have you seen in your lives?).
As far as the plot goes, both sort of lift from Bambi... Lion King does lift sort of from some play, if not Hamlet... and it really seems if they were going to steal things on purpose, they would have been a LOT more subtle towards it.
Now, the coincidence gets WORSE when you mention Atlantis, since it has the same thread as Nadia: Secrets of the Blue Water.
But hey... it's not like anyone hasn't stolen from Disney before... (cough! Enchanted tales).
I already said what their most overrated film was. Something that isn't enjoyable on every level, and is very preachy.