Mighty Mouse didn't say a whole lot in his cartoons, save for those annoying operatic shorts, until the 60's and the made-for-TV episodes. He didn't need to. He came, he saw, he saved the day.
In "Krakatoa", released three weeks before Christmas of 1945, Mighty Mouse has to bottle up the titular volcano when it erupts. The narration is minimal, as the music carries the story.