Daniel Hillard(Robin Williams) likes to entertain children. Currently his job, is providing voices for cartoons, but when he disagrees with the image that the studio wants to convey to children, he loses his job. It is also his son's birthday and feling down and wanting to do something special for him, he throws a wild children's party. When his wife Miranda(Sally Field) comes home and finds the house in shambles and after everything settles, she tells Daniel that they are on different paths and thinks that they should separate. Because Daniel's unemployed the judge feels that it's best if Daniel get his life in order first, so he allows Daniel to see his children just one day a week. But Daniel can't bear to be away from his children so long; so when Miranda decides to hire a housekeeper, Daniel alters the ad and answers it himself and pretends to be Mrs. Doubtfire, donning a disguise he becomes the new housekeeper.