On a day known to the dinosaurs as "Treasure Day", Bron becomes stuck in the Mysterious Beyond. This event urges the young Longneck Littlefoot to take his friends on a quest to the Fire Mountain to save his father. Along the way, they befriend a Flyer.
An allergy-ridden, eavesdropping sound engineer and his boisterous new roommate are thrust into a missing girl case when he discovers clues to her disappearance in his neighborhood recordings.
