The Great Egg Adventure - S1.E26

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.