I read on an ad for the Disney's One Saturday Morning Toon-Twister TV promotion that the show was going to premiere on March 13th 1999 under the title MouseWorks after the promotion was held but for some reason it didn't premiere on Disney's One Saturday Morning until May 1st that year. Why is that?
Frank Welker maybe well known as the voice of many non-talking animal characters but that does not mean he did everyone in existence. There is no official note that says Frank Welker voiced the Leviathan. Where ever you learnt that from is wrong.