Tom Hanks is doing the double at the London Film Festival - as movies starring the Oscar-winning actor will both open and close the 2013 event.
Both the stars are expected to attend the closing night gala in central London.
The festival opens on October 9 with another Hanks' film, Captain Phillips, a true-life thriller about the hijacking of a US ship by Somalian pirates.
Saving Mr Banks also stars Colin Farrell and Luther star Ruth Wilson.
Festival director Clare Stewart said: "There is only one word that gives full expression to the inventiveness and creativity of the film that will be our Closing Night Gala for the 57th BFI London Film Festival - Saving Mr. Banks is supercalifragilisticexpialidocious.
"Positively overflowing with its ebullient love of storytelling and the filmmaking process, Saving Mr Banks is also a magical ode to the brilliance and volatility of the two very different creative forces behind the making of Mary Poppins, with Emma Thompson superb as the protective author PL Travers and Tom Hanks in charming form as Walt Disney."
Producer Alison Owen said: "Saving Mr Banks is very much about British manners versus American values, as Pamela Travers and Walt Disney battle over the rights to Mary Poppins, so it feels absolutely fitting that the LFF Closing Night should be our European premiere, and we feel very honoured. We hope Pamela Travers would approve wholeheartedly.
"We filmed the London sequences in the street where Pamela lived, and London was both the start of the journey for Mary Poppins and for our movie, so we feel like we're beginning in the right place."
The 57th BFI London Film Festival in partnership with American Express runs from Wednesday October 9 until Sunday October 20.
The full programme will be announced on Wednesday September 4.