♪ That a spoon full of sugar helps the medicine go down ♪ all-time disney classic, mary poppins. Now the story is being told in a new movie, called "saving mr. Banks." Tom hanks... See More
♪ That a spoon full of sugar helps the medicine go down ♪ all-time disney classic, mary poppins. Now the story is being told in a new movie, called "saving mr. Banks." Tom hanks played in the movie of what goes on behind the scenes. ReporteARY POPPI IS THE Classic that almost never happened. Walt disney's daughters were begging him to make the movie. But the character's creator, as we see in saving mr. Banks was rather difficult. Right here in my office. Very right. All these years, almost 20 of them. Yes. It took him 20 years to get the rights from the crotchety old bat. She didn't like him. Reporter: She didn't like americans. Cartoons. Not walt disney. That brought disney up short. He was used to getting his own way. Reporter: This is the tale of the lengths walt wept to to get hi own way. Welcome to the magic kingdom. Sit all like this? Yep. Isn't it wonderful? Do you always get everything you want, walter? Pretty much. Reporter: Your wuf must be glad you got rid of the mustache? Oh, my lord, yes. I have had three jobs in a row with substantial facial hair. Reporter: Something he has to deal with, type ii diabetes. Is that from gaining right, losing weight? No, it's from years of bad eating the. Translator: First person to play walt disney on film. Daunting? Yes. Reporter: In a movie shot here in burbank and made by a company that still bears disney's name. It's a pleasure. Reporter: Appreciate your time. Cannot wait to see "saving mr. Banks."
This transcript has been automatically generated and may not be 100% accurate.