The 12-day movie showcase opens Wednesday with "Captain Phillips," a drawn-from-life thriller starring Hanks as a cargo ship captain held captive by Somali pirates.
In the festival's closer, "Saving Mr. Banks," Hanks plays a very different real-life figure
-- Walt Disney, sparring with British writer P.L. Travers over the movie adaptation of her children's classic "Mary Poppins." The film has its world premiere in London on Oct. 20.
Artistic director Clare Stewart said the double dose of Hanks is "a happy accident, but one I'm very pleased came about,"
Other stars attending the 57th London Film Festival include Sandra Bullock, Judi Dench, Carey Mulligan, Ralph Fiennes and Daniel Radcliffe.