The Land Before Time X: The Great Longneck Migration

Littlefoot has an ominous "sleep story" where he sees the "Great Circle" (the sun) falling out of the sky, and when he mentions it to his grandparents, they reveal they are sharing the same experience. Led by their instinct, Littlefoot and his friends leave on a journey with his grandparents, who have been feeling the same sense as them, joined by a Supersaurus named Sue. They soon meet Littlefoot's long-lost biological father, Bron, in a large crater where hundreds of Longnecks have gathered for a tradition involving a solar eclipse. As they prepare to "catch" the sun and propel it back up into the sky, Littlefoot must decide between staying with his friends in the Great Valley or starting a new life with his father.