The Neverending Story

1984 A troubled boy finds a magical book telling the tale of a young warrior who goes on a quest in Fantasia--a wonderful fantasy world.

Noah Hathaway, Barret Oliver, Tami Stronach, Patricia Hayes, Sydney Bromley, Gerald McRaney, Moses Gunn

Alan Oppenheimer providing voice for Falkor, Gmork, and others.

Based on "The Neverending Story" by Michael Endeon 1979.

Not sure if is a Christmas movie, but my own liked it a lot.