It's the happiest video on earth -- or rather, online.
The first trailer was released for the Walt Disney-Marry Poppins film "Saving Mr. Banks," starring Tom Hanks as Mr. Disney.
E! Online describes the film as, "Disney's effort to bring his daughters' favorite book, P.L. Travers' 'Mary Poppins,' to life on the big screen."
The highly anticipated film will also include roles played by Emma Thompson, Colin Farrell, Paul Giamatti and Jason Schwartzman.
"Saving Mr. Banks" will land in theaters Dec. 20.