It's lonely being the only Sharptooth in the Great Valley. Chomper decides to go to the Mysterious Beyond to teach the Sharpteeth how to be friends. But the Sharpteeth he meets aren't very friendly, as he soon runs into Red Claw and his Fast Biters!

The series finale. Littlefoot, Ducky, Petrie and Chomper (followed by Hyp, Nod and Mutt) find a nest of Fast Biter eggs. They decide to carry the eggs away from the valley so the baby sharpteeth can grow up without eating anyone and set off on a journey into the mysterious beyond. They don't know that the mother sharptooth is in hot pursuit though, and she wants her eggs back at all costs.