Alan Anthony Silvestri is an American composer and conductor of film and television scores. He has been associated with director Robert Zemeckis since 1984, composing music for nearly all of his feature films including the Back to the Future film series, Who Framed Roger Rabbit, Death Becomes Her, Forrest Gump, Cast Away, and The Polar Express. Silvestri also scored many other popular movies, including Predator, The Abyss, Father of the Bride, The Bodyguard, Eraser, The Parent Trap, Stuart Little, The Mummy Returns, Lilo & Stitch, The Wild, Night at the Museum trilogy, G.I. Joe: The Rise of Cobra, The Croods, Ready Player One, and several Marvel Cinematic Universe films, including the Avengers films.

The Polar Express is a 2004 American animated adventure film directed by Robert Zemeckis, who co-wrote the screenplay with William Broyles Jr., based on the 1985 children's book of the same name by Chris Van Allsburg. It stars Tom Hanks, Daryl Sabara, Nona Gaye, Jimmy Bennett, and Eddie Deezen. The film depicts human characters using live action and motion capture computer animation, with production sequences for the latter taking place from June 2003 to May 2004. Set on Christmas Eve, it tells the story of a young boy who sees a mysterious train bound for the North Pole stop outside his window and is invited aboard by its conductor. He joins other children as they embark on a journey to visit Santa Claus, who is preparing for Christmas.