The Land Before Time 10: The Great Longneck Migration (2003) full movie.
Storyline: A bedtime story leads Littlefoot and his grandparents on a journey to a new land, where Littlefoot discovers someone who vanished before he was born: his father! Now Littlefoot must decide between two worlds. Will he leave to be with his friends in the Great Valley, or stay behind and start a new life with his father? This is the decision that could forever change The Land Before Time saga.
More infor: IMDB