An eccentric millionaire and his grandchildren are embroiled in the plights of some forest gnomes who are searching for the rest of their tribe. While helping them, the millionaire is suspected of being crazy because he’s seeing gnomes! He’s committed, and the niece and nephew and the gnomes have to find him and free him.

The movie combines a diverting story, songs, color and sequences of live action blended with the movements of animated figures. Mary Poppins is a kind of Super-nanny who flies in with her umbrella in response to the request of the Banks children and proceeds to put things right with the aid of her rather extraordinary magical powers before flying off again.